[source] tools/upx: Update to 3.91 and use new tarball url

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/6f1d6fdbaa6da1266b551c37b71a37618e547318

commit 6f1d6fdbaa6da1266b551c37b71a37618e547318
Author: diizzyy <diizzyy at users.noreply.github.com>
AuthorDate: Mon Oct 3 00:45:17 2016 +0200

    tools/upx: Update to 3.91 and use new tarball url
    
    Updates UPX to version 3.91 and also updates tarball url
    
    Signed-off-by: Daniel Engberg <daniel.engberg.lists at pyret.net>
---
 tools/upx/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/upx/Makefile b/tools/upx/Makefile
index 7f212af..52d2f78 100644
--- a/tools/upx/Makefile
+++ b/tools/upx/Makefile
@@ -7,11 +7,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=upx
-PKG_VERSION:=3.09
+PKG_VERSION:=3.91
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-src.tar.bz2
-PKG_SOURCE_URL:=@SF/upx
-PKG_MD5SUM:=1253da46eac54a217eb73e2d44818e53
+PKG_SOURCE_URL:=https://github.com/upx/upx/releases/download/v$(PKG_VERSION)
+PKG_MD5SUM:=c6d0b3ea2ecb28cb8031d59a4b087a43
 PKG_CAT:=bzcat
 
 HOST_BUILD_DIR:=$(BUILD_DIR_HOST)/$(PKG_NAME)-$(PKG_VERSION)-src