vboot2: Use the right set of compiler flags for building vboot libraries

This make it pass through -fno-stack-protector, and also uses
libverstage fields consistently.
verstage is for 'stage' stuff, libverstage for all the vboot logic.

Change-Id: I3032e072414bed52effd2dc5057896781ad562c6
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/10174
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
1 file changed