build system: Rely on xcompile for HOSTCC and HOSTCXX

It already looks for them, so let's use the result instead
of blindly defaulting to gcc/g++, except when not building an image
(but run kconfig or tests) because we don't use xcompile in those cases.

Change-Id: I3e50c70a609f1903a925610928f8779c191040d8
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43145
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions