clang/test/lit.cfg: Disable dev-fd-fs on cygwin for now.

open("/dev/fd/1-foobar") fails with EEXIST on cygwin.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168676 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed