image.mk: pass through $(CONFIG_PKG_BUILD_JOBS) to the mksquashfs -processors option

SVN-Revision: 28305

include/image.mk

@@ -87,7 +87,7 @@ else
   ifneq ($(CONFIG_TARGET_ROOTFS_SQUASHFS),)
     define Image/mkfs/squashfs
 		@mkdir -p $(TARGET_DIR)/overlay
-		$(STAGING_DIR_HOST)/bin/mksquashfs4 $(TARGET_DIR) $(KDIR)/root.squashfs -nopad -noappend -root-owned -comp $(SQUASHFSCOMP) -processors 1
+		$(STAGING_DIR_HOST)/bin/mksquashfs4 $(TARGET_DIR) $(KDIR)/root.squashfs -nopad -noappend -root-owned -comp $(SQUASHFSCOMP) -processors $(if $(CONFIG_PKG_BUILD_JOBS),$(CONFIG_PKG_BUILD_JOBS),1)
 		$(call Image/Build,squashfs)
     endef
   endif