include/image: use SOURCE_DATE_EPOCH if set for squashfs + ext4 images

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

SVN-Revision: 48588

include/image.mk

@@ -173,7 +173,7 @@ $(eval $(foreach S,$(JFFS2_BLOCKSIZE),$(call Image/mkfs/jffs2/template,$(S))))
 $(eval $(foreach S,$(NAND_BLOCKSIZE),$(call Image/mkfs/jffs2-nand/template,$(S))))
 
 define Image/mkfs/squashfs
-	$(STAGING_DIR_HOST)/bin/mksquashfs4 $(TARGET_DIR) $(KDIR)/root.squashfs -nopad -noappend -root-owned -comp $(SQUASHFSCOMP) $(SQUASHFSOPT) -processors $(if $(CONFIG_PKG_BUILD_JOBS),$(CONFIG_PKG_BUILD_JOBS),1)
+	$(STAGING_DIR_HOST)/bin/mksquashfs4 $(TARGET_DIR) $(KDIR)/root.squashfs -nopad -noappend -root-owned -comp $(SQUASHFSCOMP) $(SQUASHFSOPT) -processors $(if $(CONFIG_PKG_BUILD_JOBS),$(CONFIG_PKG_BUILD_JOBS),1) $(if $(SOURCE_DATE_EPOCH),-fixed-time $(SOURCE_DATE_EPOCH))
 endef
 
 # $(1): board name
@@ -262,6 +262,7 @@ define Image/mkfs/ext4
 		-i $(CONFIG_TARGET_EXT4_MAXINODE) \
 		-m $(CONFIG_TARGET_EXT4_RESERVED_PCT) \
 		$(if $(CONFIG_TARGET_EXT4_JOURNAL),,-J) \
+		$(if $(SOURCE_DATE_EPOCH),-t $(SOURCE_DATE_EPOCH)) \
 		$(KDIR)/root.ext4 $(TARGET_DIR)/
 endef