Patch merged into coreboot/master: 19c3da5 libpayload: Do not tolerate compilation warnings when building

the following patch was just integrated into master:
commit 19c3da5e64e09d360895804be7db780d481ddc75
Author: Vadim Bendebury 
Date:   Thu May 15 14:12:54 2014 -0700

libpayload: Do not tolerate compilation warnings when building

Make sure the build breaks in case of warnings.

BUG=none

TEST= All builds succeed with the restored patch and fail when a
          compilation warning is thrown.

Original-Change-Id: I9bdcd8938f59913e4ba86df5e4921b3f821ef920
    Original-Signed-off-by: Vadim Bendebury 
    Original-Reviewed-on: https://chromium-review.googlesource.com/200110
    Original-Reviewed-by: Aaron Durbin 
    (cherry picked from commit 16dde875950d6806cc770cdbee4d3ff456ed6f02)
    Signed-off-by: Marc Jones

Change-Id: I86988f8d3f1acaa6ceeabdcbfa3cede1e67c28fe
    Reviewed-on: http://review.coreboot.org/7911
    Reviewed-by: Ronald G. Minnich 
    Tested-by: build bot (Jenkins)

See http://review.coreboot.org/7911 for details.

-gerrit