[coreboot-gerrit] Patch merged into coreboot/master: cbfstool: keep cbfs master header pointer

the following patch was just integrated into master:
commit 29a04d9ed16a854f3b3a8f98476c91230ce2ba2e
Author: Patrick Georgi 
Date:   Fri Nov 20 23:23:44 2015 +0100

cbfstool: keep cbfs master header pointer

Adding new files overwrote the header with the empty file (ie 0xff),
    so carve out some space.

BUG=chromium:445938
    BRANCH=none
    TEST=none

Change-Id: I91c292df381c2bac41c6cb9dda74dae99defd81d
    Signed-off-by: Patrick Georgi 
    Reviewed-on: https://review.coreboot.org/12789
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/12789 for details.

-gerrit