libflac: change package/source URLs to xiph.org

Signed-off-by: Ted Hess <thess@kitschensync.net>

libs/flac/Makefile

@@ -12,7 +12,7 @@ PKG_VERSION:=1.3.1
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
-PKG_SOURCE_URL:=@SF/flac
+PKG_SOURCE_URL:=http://downloads.xiph.org/releases/flac/
 PKG_MD5SUM:=b9922c9a0378c88d3e901b234f852698
 PKG_MAINTAINER:=Ted Hess <thess@kitschensync.net>
 
@@ -30,7 +30,7 @@ define Package/libflac
   SECTION:=libs
   CATEGORY:=Libraries
   TITLE:=Free Lossless Audio Codec library
-  URL:=http://flac.sourceforge.net/
+  URL:=https://xiph.org/flac
 endef
 
 CONFIGURE_ARGS += \