Patch merged into coreboot/master: libpayload: don't overwrite CFLAGS

the following patch was just integrated into master:
commit 9b8c738942c79c5c34e09d78bbe000cc8a8dfb46
Author: Patrick Georgi 
Date:   Mon Jul 6 09:09:30 2015 +0000

libpayload: don't overwrite CFLAGS

Makefile already sets it to contain the architecture specific flags,
    don't drop them, but add to that instead.

Change-Id: I147e6480ab2b3c1ee4f4ace511197b4ba94280b8
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/10804
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10804 for details.

-gerrit