[clang] Fix SemaCXX/msvc-pragma-function-no-builtin-attr.cpp test (PR #119873)

[Richard Dzenis via cfe-commits]

https://github.com/RIscRIpt approved this pull request.

LGTM, this fixes `clang/test/SemaCXX/msvc-pragma-function-no-builtin-attr.cpp` on macOS.

https://github.com/llvm/llvm-project/pull/119873