Patch merged into coreboot/master: genbuild_h.sh: Get current rev for git revision, not origin/master

the following patch was just integrated into master:
commit 4af365562257ebaadc6513d5c5be9eecda318e87
Author: Martin Roth 
Date:   Sat Dec 26 19:55:31 2015 -0700

genbuild_h.sh: Get current rev for git revision, not origin/master

Using origin/master as the git revision breaks reproducibility, giving
    different values depending on when the code was pulled from the
    repo at coreboot.org.  By using the current revision instead, we get
    identical builds.

Change-Id: If4be6e048d6c8e417b8c074199745900ccd82b49
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/12807
    Tested-by: build bot (Jenkins)
    Reviewed-by: Zheng Bao 
    Reviewed-by: Paul Menzel 
    Reviewed-by: Alexandru Gagniuc

See https://review.coreboot.org/12807 for details.

-gerrit