Patch merged into filo/master: df119be makefile: rebuild config.h when needed

the following patch was just integrated into master:
commit df119bed3bad665af86209cb41111ccc8754f2f6
Author: Mathias Krause 
Date:   Tue Mar 6 09:16:29 2012 +0100

makefile: rebuild config.h when needed

The dependencies for filo are quite awkward. Fix this by moving them
    where they belong to be, namely:
    * object files (not filo) depend on config.h
    * config.h (not filo) depends on .config to fix build problems when
      build/ gets removed or .config gets manually edited

Change-Id: Ic107ad4d37cb6ce128ee3ad62cb8d271b457f91a
    Signed-off-by: Mathias Krause

Build-Tested: build bot (Jenkins) at Tue Mar  6 16:45:39 2012, giving +1
Reviewed-By: Stefan Reinauer  at Tue Mar  6 21:53:10 2012, giving +2
See http://review.coreboot.org/741 for details.

-gerrit