Patch merged into coreboot/master: libpayload: Add compiler switch

the following patch was just integrated into master:
commit b7d8f26eec171aa6964cf617221aeb2eaec0a976
Author: Patrick Georgi 
Date:   Mon Jul 6 09:04:42 2015 +0000

libpayload: Add compiler switch

clang is totally untested, but it mirrors coreboot now.

Change-Id: I0e13ff8bba2007159a4a795ca07d187504b606b2
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/10800
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10800 for details.

-gerrit