[coreboot] Patch merged into coreboot/master: 6585f29 Makefile: No need to mkdir when distclean

the following patch was just integrated into master:
commit 6585f291def1f7cbeb2ccf42f9d6ce916f68ea24
Author: Zheng Bao 
Date:   Mon Oct 22 16:36:03 2012 +0800

Makefile: No need to mkdir when distclean

make distclean causes error on mingw:
    -------
    rm: cannot lstat `build/util': Permission denied
    make: *** [distclean] Error 1
    -------
    Guess, When the distclean is made by multi-process, the mkdir
    in the Makefile will execute when build is removed. That causes
    conflicts.

Change-Id: Ia41ecc5d1db2fa9d3328c81ac1d33fa94779492d
    Signed-off-by: Zheng Bao 
    Signed-off-by: Zheng Bao

Reviewed-By: Patrick Georgi  at Mon Oct 22 13:49:57 2012, giving +2
See http://review.coreboot.org/1602 for details.

-gerrit