Don't skip already built targets anymore, because a recent change could have

Don't skip already built targets anymore, because a recent change could have
broken them again. Instead rely on coreboot's dependencies to figure out
what to rebuild.

Signed-off-by: Stefan Reinauer <stepan@coreboot.org>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6162 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1