Patch merged into coreboot/master: ba80887 vboot2: Build verstage archive, then use that for building the stage

the following patch was just integrated into master:
commit ba80887cfdbca8e804a4191997a9beaa5ce44f6f
Author: Patrick Georgi 
Date:   Mon Apr 27 18:09:22 2015 +0200

vboot2: Build verstage archive, then use that for building the stage

This slightly streamlines integrating the vboot2 library and
    prepares for merging verstage and bootblock on selected devices.

Change-Id: I2163d1411d0c0c6bf80bce64796e1b6a5a02b802
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/10004
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10004 for details.

-gerrit