download.mk: properly quote download urls

SVN-Revision: 26129

include/download.mk

@@ -41,7 +41,7 @@ define DownloadMethod/unknown
 endef
 
 define DownloadMethod/default
-	$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(FILE)" "$(MD5SUM)" $(URL)
+	$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(FILE)" "$(MD5SUM)" $(foreach url,$(URL),"$(url)")
 endef
 
 define wrap_mirror