Patch merged into coreboot/master: buildgcc: Fix function prototype in GCC

the following patch was just integrated into master:
commit aa89fb4618987e5c5034f2370381168853cc7308
Author: Nico Huber 
Date:   Sun Dec 4 01:39:44 2016 +0100

buildgcc: Fix function prototype in GCC

With some newer versions of GCC (experienced with GCC 6.2.1 on Arch-
    Linux) the first stage of a boostrapping fails due to a mismatching
    function prototype. Also add a missing `static` to the signature.

Change-Id: Ia927036ccd725550f1191890515578bc80c74f80
    Signed-off-by: Nico Huber 
    Reviewed-on: https://review.coreboot.org/17704
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer 
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/17704 for details.

-gerrit