xcompile: also look for *-linux compiler triplet

Not just *-linux-gnu.

Change-Id: Ib817c6d207d3b69ce7595505f2b45f3be35b7d2f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13420
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
1 file changed