build: prepare tmpinfo before generating config

Makefile

@@ -199,6 +199,7 @@ feeds: FORCE
 	+$(GLUONMAKE_EARLY) prepare-tmpinfo
 
 config: FORCE
+	+$(GLUONMAKE) prepare-tmpinfo
 	( \
 		cat $(GLUONDIR)/include/config $(GLUONDIR)/targets/$(GLUON_TARGET)/config; \
 		echo '$(patsubst %,CONFIG_PACKAGE_%=m,$(sort $(filter-out -%,$(GLUON_DEFAULT_PACKAGES) $(GLUON_SITE_PACKAGES) $(PROFILE_PACKAGES))))' \