Windows/Path.inc: Introduce file_type::character_file and file_type::fifo_file in sys::fs::getStatus(HANDLE).

It fixes llvm/test/Other/close-stderr.ll on msys.

FIXME: Provide unittests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186588 91177308-0d34-0410-b5e6-96231b3b80d8