Patch merged into coreboot/master: cd9abf9 arch/x86/Makefile.inc: Pass $(AS) and $(CPP) to SeaBIOS

the following patch was just integrated into master:
commit cd9abf95e7fe3d67f02e5e0197efa2688db83d22
Author: Andrew Wu 
Date:   Tue Sep 3 20:39:48 2013 +0800

arch/x86/Makefile.inc: Pass $(AS) and $(CPP) to SeaBIOS

SeaBIOS’ Makefile requires cpp (C Preprocessor) to build. Modify
    the xcompile script to search for cpp program path, and pass it to
    SeaBIOS’ `Makefile.inc`. Also pass the program path for as (GNU assembler).

This is needed, so the crossgcc toolchain to build the SeaBIOS payload
    under Mac OSX. OSX ships a cpp program, but it works differently
    from GNU CPP, so we need to override it.

Change-Id: If996ffbb76ec4bd16079b54b41f3fac07bfe25be
    Signed-off-by: Andrew Wu 
    Reviewed-on: http://review.coreboot.org/3896
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Jonathan A. Kollasch

See http://review.coreboot.org/3896 for details.

-gerrit