xcompile: Don't warn on missing power8 compiler

Until there's a reason to, don't print a warning about the missing
power8 compiler.

Change-Id: I47c60e0a16892f0fa228e1439e0424926bca00a4
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12634
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
1 file changed