llvm/test/Other/close-stderr.ll: Mark this as XFAIL on msys, since r186560.

sys::fs::status() doesn't work on pipes. Investigating.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186586 91177308-0d34-0410-b5e6-96231b3b80d8