Relax test to pass with windows paths.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193532 91177308-0d34-0410-b5e6-96231b3b80d8
More windows path handling.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193533 91177308-0d34-0410-b5e6-96231b3b80d8