MinGW seems to compile currently without warnings, so it should
be safe to enable -Werror now for this environment, too.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1465373606-18486-1-git-send-email-thuth@redhat.com>
Tested-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>