[coreboot] Patch merged into coreboot/master: afb58bf buildsystem: ensure directory exists before use

the following patch was just integrated into master:
commit afb58bfd0df28c0d59126129322be953d1db6060
Author: Patrick Georgi 
Date:   Fri Sep 21 18:11:59 2012 +0200

buildsystem: ensure directory exists before use

In some cases we request mktemp to create a temporary file in
    $(obj)/mainboard/... before it exists.
    Let's make sure the directory exists

Change-Id: I51f0065c30b1f25eb501a6fd5edefb3f4c15d0ab
    Signed-off-by: Patrick Georgi

See http://review.coreboot.org/1532 for details.

-gerrit