secimage does not use libgmp, so don't link it in. (Otherwise linking fails if the library is not installed) Change-Id: I24af21c7754ecd0109f3e86669fa34fa6991d7fe Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Reviewed-on: http://review.coreboot.org/11079 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>