test: XFAIL windows for non-portable test

This test validates that the lock_guard is declared variadically across
C++03 and C++11.  Given the lack of stable ABI on Windows and the fact
that the RTTI encoding on Windows is different, XFAIL it on that target.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294720 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed