gcc: Use URL alias

Remove hardcoded URL and use alias instead.

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

devel/gcc/Makefile

@@ -11,9 +11,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=gcc
 PKG_VERSION:=4.8.3
 PKG_RELEASE:=1
-PKG_SOURCE_URL:=ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/gcc-$(PKG_VERSION) \
-     http://mirrors.rcn.net/pub/sourceware/gcc/releases/gcc-$(PKG_VERSION) \
-    ftp://ftp.gnu.org/gnu/gcc/releases/gcc-$(PKG_VERSION)
+PKG_SOURCE_URL:=@GNU/gcc/gcc-$(PKG_VERSION)
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_MD5SUM:=7c60f24fab389f77af203d2516ee110f