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>
1db856d08a