Patch merged into coreboot/master: build system: Allow overriding the path to the futility binary

the following patch was just integrated into master:
commit 32154d7b1211faab3d37eab0b00154a7f190eb23
Author: Patrick Georgi 
Date:   Tue Mar 15 23:14:08 2016 +0100

build system: Allow overriding the path to the futility binary

Change-Id: I84e68e8407149780769c3e6a1148c175e42d1025
    Signed-off-by: Patrick Georgi 
    Reviewed-on: https://review.coreboot.org/14100
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/14100 for details.

-gerrit