[libcxx] [test] Disable a test regarding error behaviour for excessively long paths on windows

Checking for the existence of an invalid long path name isn't
an error in itself on windows.

Differential Revision: https://reviews.llvm.org/D98141

GitOrigin-RevId: 8ba05e14897eb2e817bab5bb4ac4540741f5fef8
1 file changed