When .xcompile doesn't already exist, building libpayload fails because the CC variable (et al) remain empty since .xcompile is only included after the variables coming from there are evaluated. Change-Id: I73f1cbced95afcff15839604fea5fd05d81bc3d3 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: https://review.coreboot.org/18228 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>