Patch merged into coreboot/master: add support for power8 to xcompile script

the following patch was just integrated into master:
commit b135baa0dbcd8a3f1a1fa0a156c17406149bd8d9
Author: Ronald G. Minnich 
Date:   Wed Dec 2 20:24:15 2015 +0000

add support for power8 to xcompile script

power8 is set up by ibm as a powerpc subset, so we follow
    that rule here: we call it a powerpc but require -mcpu=power8

Change-Id: Ib5212be22db9584b0dc0eeed5c06ec1924347067
    Signed-off-by: Ronald G. Minnich 
    Reviewed-on: https://review.coreboot.org/12624
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/12624 for details.

-gerrit