[Issue 21941] dtoh:Warning about keyword identifiers should include C extensions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21941

--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@MoonlightSentinel created dlang/dmd pull request #12707 "Issue 21941 - Extend
the list of reserved words for dtoh:" mentioning this issue:

- Issue 21941 - Extend the list of reserved words for dtoh:

  Adds several entries regarding C(++) keywords, extensions and default
  macros provided by gcc and clang.

  Doesn't "fix" the issue because the list is confined to common keywords
  and not an exhaustive list of all possible extensions.

https://github.com/dlang/dmd/pull/12707

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