Confusing comment typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187895 91177308-0d34-0410-b5e6-96231b3b80d8
lit/LitConfig.py: Fixup for msys bash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187896 91177308-0d34-0410-b5e6-96231b3b80d8