Patch merged into coreboot/master: Makefile.inc: make sure .xcompile is removed when building tools

the following patch was just integrated into master:
commit 317b58234ab79be65320f0acb00b6990a8cc7b51
Author: Martin Roth 
Date:   Sun Nov 29 11:28:26 2015 -0700

Makefile.inc: make sure .xcompile is removed when building tools

Most of the toolchain build targets already ran clean-for-update, but
    there were a few that didn't.  Add the clean to those targets.

Change-Id: I7faad32ac8bb1815e0c58e7d142ca2dbfc877896
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/12571
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/12571 for details.

-gerrit