message: disable toolchain-clang-cl.test on non-windows
  The recently added test fail on non-windows platforms.
diff: -REQUIRES: lld
  +REQUIRES: lld, system-windows
  RUN: %build -n --verbose --arch=32 --compiler=clang-cl --mode=compile-and-link -o %t/foo.exe foobar.c \
  RUN: | FileCheck --check-prefix=CHECK-32 %s
  