Enable nacl-clang testing on windows
Enable nacl-clang testing on windows

Now that the host-specific behavior of nacl-clang has been stamped
out, it should just work.

R=jfb@chromium.org,jvoung@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3946

Review URL: https://codereview.chromium.org/848203003

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client