update OpenWRT's makefile

openwrt/Makefile

@@ -4,11 +4,8 @@ PKG_NAME:=shadowsocks-libev
 PKG_VERSION:=1.4.4
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
-PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=https://github.com/madeye/shadowsocks-libev.git
-PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=f403bc7f06c1ee0fc94313788b78ded902a59d43
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
+PKG_SOURCE_URL:=https://github.com/madeye/shadowsocks-libev/archive
+PKG_SOURCE:=v$(PKG_SOURCE_VERSION).tar.gz
 PKG_MAINTAINER:=Max Lv <max.c.lv@gmail.com>
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)