Patch merged into coreboot/master: buildgcc: Add support for gdb on x86_64-elf

the following patch was just integrated into master:
commit 9b64dc4226eae9f11a622335b8e27e21e63c4f38
Author: Stefan Reinauer 
Date:   Sat Feb 27 12:33:39 2016 -0800

buildgcc: Add support for gdb on x86_64-elf

Change-Id: I99f5842d1dc03b3f2d747c5abae7170214313284
    Signed-off-by: Stefan Reinauer 
    Reviewed-on: https://review.coreboot.org/13848
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Martin Roth

See https://review.coreboot.org/13848 for details.

-gerrit