clang/test/Tooling/clang-check.cpp: Mark it as XFAIL also on cygwin.

It seems clang-check doesn't like gcc driver on cygming. Investigating.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154066 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed