xcompile: Also try clang variants under the $triplet-clang scheme

That seems to be the more reliable way to build clang cross compilers
for now.

Change-Id: I14fe767d20f91b64e96c909291760bddcd108e5c
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/19660
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed