[coreboot-gerrit] Patch merged into coreboot/master: xcompile: Redirect the objdump stderr to /dev/null

the following patch was just integrated into master:
commit 669807682ed4fe2d01295bf99fe63c4c097ebc6f
Author: zbao 
Date:   Fri Sep 18 06:17:09 2015 -0700

xcompile: Redirect the objdump stderr to /dev/null

On system with clang, "as" is available but "objdump" is not by default.
    So if ${gccprefix} is empty, "as" can run successfully and the "objdump"
    below might report error. Mask that output.

Change-Id: I9940f069f66e097973ed6138cf3c696087fa5531
    Signed-off-by: Zheng Bao 
    Signed-off-by: Zheng Bao 
    Reviewed-on: http://review.coreboot.org/11681
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Alexandru Gagniuc 
    Reviewed-by: Martin Roth

See http://review.coreboot.org/11681 for details.

-gerrit