tools: make_ext4fs: switch to LEDE git mirror

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

tools/make-ext4fs/Makefile

@@ -11,7 +11,7 @@ PKG_NAME:=make-ext4fs
 PKG_VERSION:=2016-08-14
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=http://git.openwrt.org/project/make_ext4fs.git
+PKG_SOURCE_URL=$(LEDE_GIT)/project/make_ext4fs.git
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_VERSION:=484903e4332be6c317f531b008cb2a841a18c506
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)