libpayload: fix build

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>
1 file changed