[Issue 17791] Add __traits(isDeprecated, ...)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17791

--- Comment #4 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #12093 "[dmd-cxx] Backport more recent traits to the C++
port" was merged into dmd-cxx:

- 349f960f54688b70a38f3e40bd2df5b67f5dbafc by dunkyp:
  [dmd-cxx] fix issue 17791 - add __traits(deprecated, symbol)

https://github.com/dlang/dmd/pull/12093

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