[coreboot-gerrit] Patch merged into coreboot/master: Makefile.inc: error if UPDATE_IMAGE is enabled with no coreboot.rom

the following patch was just integrated into master:
commit b8f8cdbd9ea5a3fd5f73e40c63edc8f33f2b53f3
Author: Martin Roth 
Date:   Wed Jan 20 14:54:27 2016 -0700

Makefile.inc: error if UPDATE_IMAGE is enabled with no coreboot.rom

Instead of just failing with the statement:
    'mv: cannot stat ‘coreboot.rom’: No such file or directory',
    fail with an error that helps the user understand the issue.

Change-Id: Ie693d45710f599991514e0803a7c444636e473c9
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/13065
    Tested-by: build bot (Jenkins)
    Reviewed-by: Nico Huber

See https://review.coreboot.org/13065 for details.

-gerrit