The only compiler variable that is still needed is $(CC), for
contrib/plugins/Makefile.  All firmware builds have their own
config-host.mak file.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220517092616.1272238-17-pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220527153603.887929-28-alex.bennee@linaro.org>