asm fix for older gcc versions.
* cipher/crc-intel-pclmul.c: Remove extra trailing colon from asm statements.
gcc 4.2 is not able to grok a third colon without clobber
expressions. Reported for FreeBSD 9.
- GnuPG-bug-id: T2326
- Signed-off-by: Werner Koch <wk@gnupg.org>