Patch merged into coreboot/master: 02ac6c3 build system: only do the compiler test for gcc

the following patch was just integrated into master:
commit 02ac6c3572e2aedae256597133a1414c0e2e7f0c
Author: Patrick Georgi 
Date:   Fri Nov 28 23:08:51 2014 +0100

build system: only do the compiler test for gcc

There isn't a history of broken clang compilers yet
    so let's give it a chance.

Change-Id: Iddb63700e3850116313c1ddee69111f936191055
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/7607
    Tested-by: build bot (Jenkins)
    Reviewed-by: Edward O'Callaghan

See http://review.coreboot.org/7607 for details.

-gerrit