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

[Richard Dzenis via cfe-commits]

RIscRIpt wrote:

This should fix https://lab.llvm.org/buildbot/#/builders/190/builds/11300

I am compiling clang locally to verify that there would be no other problems with the test on macOS.

> I suppose this is the reason check-clang fails today.

Are there other test failures related to 84b0f0145887bbfe49fd4dc85490b14108a72cee ?

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