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 <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12571
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed