Patch merged into coreboot/master: buildgcc: Add coreboot toolchain string to clang version

the following patch was just integrated into master:
commit fb5647a60bbe56b654a9ce9d8e9f307b1d9fd10d
Author: Martin Roth 
Date:   Fri Dec 18 09:26:45 2015 -0700

buildgcc: Add coreboot toolchain string to clang version

clang version now returns:
    coreboot toolchain v1.33 November 25th, 2015 clang version 3.6.1
    (tags/RELEASE_361/final) (based on LLVM 3.6.1)

Change-Id: I948d7f4d06c244987342cfc7d5c7e728cbed93bd
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/12777
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/12777 for details.

-gerrit