xcompile: Remove warnings about missing tools & architectures

Let toolchain.inc error out when the architecture or tool is missing.

Change-Id: I39a51e5a2c778d6bbc50354807e5e2b717fa9e52
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12682
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed