Add support for factory images with other suffixes than .bin and profiles without factory images

This adds the new macro GluonProfileFactorySuffix which can be used to override
the factory images suffix ".bin". When the suffix is set to the empty string
Gluon will assume that there are no factory images.

Makefile

@@ -57,6 +57,9 @@ image/$(1): FORCE
 	+@$$(GLUONMAKE) $$@
 endef
 
+define GluonProfileFactorySuffix
+endef
+
 define GluonModel
 endef
 
@@ -127,9 +130,14 @@ define GluonProfile
 PROFILES += $(1)
 PROFILE_PACKAGES += $(filter-out -%,$(2) $(GLUON_$(1)_SITE_PACKAGES))
 GLUON_$(1)_DEFAULT_PACKAGES := $(2)
+GLUON_$(1)_FACTORY_SUFFIX := .bin
 GLUON_$(1)_MODELS :=
 endef
 
+define GluonProfileFactorySuffix
+GLUON_$(1)_FACTORY_SUFFIX := $(2)
+endef
+
 define GluonModel
 GLUON_$(1)_MODELS += $(3)
 GLUON_$(1)_MODEL_$(3) := $(2)
@@ -339,11 +347,13 @@ image: FORCE
 		PROFILE="$(PROFILE)" KDIR="$(PROFILE_KDIR)" TARGET_DIR="$(TARGET_DIR)" BIN_DIR="$(BIN_DIR)" TMP_DIR="$(TMP_DIR)"
 
 	$(foreach model,$(GLUON_$(PROFILE)_MODELS), \
-		rm -f $(GLUON_IMAGEDIR)/factory/gluon-*-$(model).bin && \
 		rm -f $(GLUON_IMAGEDIR)/sysupgrade/gluon-*-$(model)-sysupgrade.bin && \
-		\
-		cp $(BIN_DIR)/gluon-$(GLUON_$(PROFILE)_MODEL_$(model))-factory.bin $(GLUON_IMAGEDIR)/factory/$(IMAGE_PREFIX)-$(model).bin && \
 		cp $(BIN_DIR)/gluon-$(GLUON_$(PROFILE)_MODEL_$(model))-sysupgrade.bin $(GLUON_IMAGEDIR)/sysupgrade/$(IMAGE_PREFIX)-$(model)-sysupgrade.bin && \
+		\
+		$(if $(GLUON_$(PROFILE)_FACTORY_SUFFIX), \
+			rm -f $(GLUON_IMAGEDIR)/factory/gluon-*-$(model)$(GLUON_$(PROFILE)_FACTORY_SUFFIX) && \
+			cp $(BIN_DIR)/gluon-$(GLUON_$(PROFILE)_MODEL_$(model))-factory$(GLUON_$(PROFILE)_FACTORY_SUFFIX) $(GLUON_IMAGEDIR)/factory/$(IMAGE_PREFIX)-$(model)$(GLUON_$(PROFILE)_FACTORY_SUFFIX) && \
+		) \
 	) :
 
 image/%: $(gluon_prepared_stamp)