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Some of the MSVC compiler args and predefined macros are not being handled

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Since Sep 8, 2026.

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Description

bug fixed Language Service

See https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-180

One recent user reported case was https://github.com/microsoft/vscode-cpptools/issues/14310

  • /Zc:__STDC__ isn't using --ms_stdc and defining __STDC__.
  • /Za isn't defing __STDC__.
    ...it seems like there could be a lot more...maybe we could postpone this till users ask for specific args to be handled? Some of these are probably pretty rarely used?
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