AIX release builds broken

从 Makefile:1417 处失败的 Makefile 目标和 tools/install.py 开始，将 6 月 21 日失败的 AIX 发布输出与成功示例进行比较。跟踪 tools/install.py 之前的 release-tarball 步骤；完成的标准是 AIX 发布构建完成并生成 tarball。

Starting 21 June release AIX builds have been failing.

e.g.

07:18:59 if [ ! -r node ] || [ ! -L node ]; then \
07:18:59   ln -fs out/Release/node node; fi
07:18:59 gmake: *** [Makefile:1417: node-v27.0.0-nightly20260621665daeb54c-aix-ppc64.tar] Error 2
07:18:59 Build step 'Conditional steps (multiple)' marked build as failure
07:18:59 Archiving artifacts

There's not a lot to go on here, but for a passing build the output would be

07:23:12 if [ ! -r node ] || [ ! -L node ]; then \
07:23:12   ln -fs out/Release/node node; fi
07:23:12 /opt/freeware/bin/python3 tools/install.py install --dest-dir 'node-v27.0.0-nightly20260620a17d2b8fe3-aix-ppc64' --prefix '/'
07:23:12 installing /home/iojs/build/ws/node-v27.0.0-nightly20260620a17d2b8fe3-aix-ppc64/bin/node
07:23:12 installing /home/iojs/build/ws/node-v27.0.0-nightly20260620a17d2b8fe3-aix-ppc64/share/doc/node/gdbinit
07:23:12 installing /home/iojs/build/ws/node-v27.0.0-nightly20260620a17d2b8fe3-aix-ppc64/share/doc/node/lldb_commands.py
07:23:12 installing /home/iojs/build/ws/node-v27.0.0-nightly20260620a17d2b8fe3-aix-ppc64/share/man/man1/node.1
...

Builds on the test CI are generally passing, which would point to a part of the build that is only run for the release tar balls (during or just before running tools/install.py).

Opening this here instead of the Build WG repository as no changes have been made to AIX release machine in the time period when the builds started to fail.