Meson tries to use install_name_tool and otools when install_name_tool exists on ninja install, even with native linux build and installation

Describe the bug

When ninja install-ing sway package in a fakeroot (as run by makepkg) on Archlinux, meson is taking some path that should be reserved to darwin systems and try to call otool. I do have cross-compilation tools installed on my system for the darwin platform. Assigned to meson since sway project doesn't have reference to otool in its repository.

Full logs and stacktrace below:

~/workspace/archofficiel/community/sway/repos/community-x86_64 ‹master› 
╰─$ makepkg                                                                                                                         1 ↵
==> Making package: sway 1:1.5.1-1 (Wed 25 Nov 2020 12:09:10 PM CET)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Found sway-1.5.1.tar.gz
  -> Found sway-1.5.1.tar.gz.sig
  -> Found 50-systemd-user.conf
==> Validating source files with sha512sums...
    sway-1.5.1.tar.gz ... Passed
    sway-1.5.1.tar.gz.sig ... Skipped
    50-systemd-user.conf ... Passed
==> Verifying source file signatures with gpg...
    sway-1.5.1.tar.gz ... Passed
==> Extracting sources...
  -> Extracting sway-1.5.1.tar.gz with bsdtar
==> Starting prepare()...
==> Removing existing $pkgdir/ directory...
==> Starting build()...
+ exec meson setup --prefix /usr --libexecdir lib --sbindir bin --buildtype plain --auto-features enabled --wrap-mode nodownload -D b_lto=true -D b_pie=true build sway-1.5.1 -D werror=false -D b_ndebug=true
Directory already configured.

Just run your build command (e.g. ninja) and Meson will regenerate as necessary.
If ninja fails, run "ninja reconfigure" or "meson --reconfigure"
to force Meson to regenerate.

If build failures persist, run "meson setup --wipe" to rebuild from scratch
using the same options as passed when configuring the build.
To change option values, run "meson configure" instead.
ninja: Entering directory `build'
[0/1] Regenerating build files.
The Meson build system
Version: 0.56.0
Source dir: /home/alexandre/workspace/archofficiel/community/sway/repos/community-x86_64/src/sway-1.5.1
Build dir: /home/alexandre/workspace/archofficiel/community/sway/repos/community-x86_64/src/build
Build type: native build
Project name: sway
Project version: 1.5.1
C compiler for the host machine: ccache gcc (gcc 10.2.0 "gcc (GCC) 10.2.0")
C linker for the host machine: gcc ld.bfd 2.35.1
Host machine cpu family: x86_64
Host machine cpu: x86_64
Dependency json-c found: YES 0.15 (cached)
Dependency libpcre found: YES 8.44 (cached)
Dependency wayland-server found: YES 1.18.0 (cached)
Dependency wayland-client found: YES 1.18.0 (cached)
Dependency wayland-cursor found: YES 1.18.0 (cached)
Dependency wayland-egl found: YES 18.1.0 (cached)
Dependency wayland-protocols found: YES 1.20 (cached)
Dependency xkbcommon found: YES 1.0.2 (cached)
Dependency cairo found: YES 1.17.3 (cached)
Dependency pango found: YES 1.48.0 (cached)
Dependency pangocairo found: YES 1.48.0 (cached)
Dependency gdk-pixbuf-2.0 found: YES 2.42.0 (cached)
Dependency pixman-1 found: YES 0.40.0 (cached)
Dependency glesv2 found: YES 3.2 (cached)
Dependency libevdev found: YES 1.10.0 (cached)
Dependency libinput found: YES 1.16.3 (cached)
Dependency libsystemd found: YES 246 (cached)
Found pkg-config: /usr/bin/pkg-config (1.7.3)
Found CMake: /usr/bin/cmake (3.19.0)
Run-time dependency libelogind found: NO (tried pkgconfig and cmake)
Dependency xcb found: YES 1.14 (cached)
Run-time dependency bash-completion found: NO (tried pkgconfig and cmake)
Run-time dependency fish found: NO (tried pkgconfig and cmake)
Library m found: YES
Library rt found: YES
Neither a subproject directory nor a wlroots.wrap file was found.
Subproject  wlroots is buildable: NO (disabling)
Dependency wlroots found: YES 0.12.0 (cached)
Fetching value of define "WLR_HAS_XWAYLAND" with dependency wlroots: 1 (cached)
Dependency scdoc found: YES 1.11.0 (cached)
Program /usr/bin/scdoc found: YES (/usr/bin/scdoc)
Program sh found: YES (/usr/bin/sh)
Program git found: YES (/usr/bin/git)
Compiler for C supports arguments -fmacro-prefix-map=/prefix/to/hide=: YES (cached)
Configuring config.h using configuration
Dependency wayland-scanner found: YES 1.18.0 (cached)
Program /usr/bin/wayland-scanner found: YES (/usr/bin/wayland-scanner)
Configuring config using configuration
Build targets in project: 38

sway 1.5.1

      xwayland: YES
    gdk-pixbuf: YES
       systemd: YES
       elogind: NO
          tray: YES
     man-pages: YES

  Subprojects
       wlroots: NO Neither a subproject directory nor a wlroots.wrap file was found.

Option werror is: false [default: true]
Found ninja-1.10.1 at /usr/bin/ninja
ninja: no work to do.
==> Entering fakeroot environment...
==> Starting package()...
ninja: Entering directory `build'
[0/1] Installing files.
Installing sway.1 to /home/alexandre/workspace/archofficiel/community/sway/repos/community-x86_64/pkg/sway/usr/share/man/man1
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/mesonbuild/mesonmain.py", line 140, in run
    return options.run_func(options)
  File "/usr/lib/python3.8/site-packages/mesonbuild/minstall.py", line 554, in run
    installer.do_install(datafilename)
  File "/usr/lib/python3.8/site-packages/mesonbuild/minstall.py", line 372, in do_install
    self.install_targets(d)
  File "/usr/lib/python3.8/site-packages/mesonbuild/minstall.py", line 527, in install_targets
    depfixer.fix_rpath(outname, t.rpath_dirs_to_remove, install_rpath, final_path,
  File "/usr/lib/python3.8/site-packages/mesonbuild/scripts/depfixer.py", line 484, in fix_rpath
    fix_darwin(fname, new_rpath, final_path, install_name_mappings)
  File "/usr/lib/python3.8/site-packages/mesonbuild/scripts/depfixer.py", line 396, in fix_darwin
    rpaths = get_darwin_rpaths_to_remove(fname)
  File "/usr/lib/python3.8/site-packages/mesonbuild/scripts/depfixer.py", line 377, in get_darwin_rpaths_to_remove
    out = subprocess.check_output(['otool', '-l', fname],
  File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.8/subprocess.py", line 489, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/lib/python3.8/subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'otool'
FAILED: meson-install 
/usr/bin/meson install --no-rebuild
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in package().
    Aborting...

To Reproduce

With makepkg tools installed (like, on archlinux):

git clone https://github.com/archlinux/svntogit-community community
cd community/sway/repos/community-x86_64/
makepkg

I didn't try on a clean archlinux install yet.

Expected behavior

The package install normally.

system parameters

• This is a plain native build
• Up-to-date archlinux
• Python version 3.8.6
• Archlinux upstream meson version 0.56.0
• Ninja version 1.10,1