[coreboot] Patch merged into coreboot/master: 924df9b abuild: Don't try to use files that don't exist

the following patch was just integrated into master:
commit 924df9b71a38bf7d7a16faea3d84a49d5d9d015d
Author: Patrick Georgi 
Date:   Mon Nov 7 19:01:54 2011 +0100

abuild: Don't try to use files that don't exist

Collecting per-board abuild.xml is bound to fail if there
    are no such files.

Change-Id: I6bd6b4389beda51654005e0380f0e52f006642db
    Signed-off-by: Patrick Georgi

Build-Tested: build bot (Jenkins) at Mon Nov  7 19:44:28 2011, giving +1
Reviewed-By: Stefan Reinauer  at Mon Nov  7 22:02:03 2011, giving +2
See http://review.coreboot.org/422 for details.

-gerrit