[source] libunwind: use url alias

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/509708889ca28643cf0d7d9c75a2a72ef386e4e1

commit 509708889ca28643cf0d7d9c75a2a72ef386e4e1
Author: diizzyy <diizzyy at users.noreply.github.com>
AuthorDate: Fri Sep 23 18:15:38 2016 +0200

    libunwind: use url alias
    
    Use alias instead of hardcoded URL
    
    Signed-off-by: Daniel Engberg <daniel.engberg.lists at pyret.net>
---
 package/libs/libunwind/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/libs/libunwind/Makefile b/package/libs/libunwind/Makefile
index ec19656..6cec8a7 100644
--- a/package/libs/libunwind/Makefile
+++ b/package/libs/libunwind/Makefile
@@ -12,7 +12,7 @@ PKG_VERSION:=1.1
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=http://download.savannah.gnu.org/releases/libunwind
+PKG_SOURCE_URL:=@SAVANNAH/$(PKG_NAME)
 PKG_MD5SUM:=fb4ea2f6fbbe45bf032cd36e586883ce
 PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1