imagebuilder: use file_copy to deploy files/ in the image generation phase

SVN-Revision: 34439

target/imagebuilder/files/Makefile

@@ -134,15 +134,7 @@ package_install: FORCE
 copy_files: FORCE
 	@echo
 	@echo Copying extra files
-	@( cd $(USER_FILES); find -type f ) | \
-		( cd $(TARGET_DIR); while :; do \
-			read FILE; \
-			[ -z "$$FILE" ] && break; \
-			[ -L "$$FILE" ] || continue; \
-			echo "Removing symlink $(TARGET_DIR)/$$FILE"; \
-			rm -f "$$FILE"; \
-		done; )
-	$(CP) $(USER_FILES)/* $(TARGET_DIR)/
+	@$(call file_copy,$(USER_FILES)/*,$(TARGET_DIR)/)
 
 package_postinst: FORCE
 	@echo