mn10300: provide __ucmpdi2() for MN10300

Provide __ucmpdi2() for MN10300 so that allmodconfig can be built.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>