[source] libs/libpcap: Rework URLs

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/7dc2a581b9bdae676d44e91fb89aba42b6d6676d

commit 7dc2a581b9bdae676d44e91fb89aba42b6d6676d
Author: Daniel Engberg <daniel.engberg.lists at pyret.net>
AuthorDate: Wed Mar 22 08:00:40 2017 +0100

    libs/libpcap: Rework URLs
    
    Add mirror and use main site as last resort.
    Source: http://www.tcpdump.org/mirrors.html
    
    Signed-off-by: Daniel Engberg <daniel.engberg.lists at pyret.net>
---
 package/libs/libpcap/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/libs/libpcap/Makefile b/package/libs/libpcap/Makefile
index 4d0ce40..e702d5c 100644
--- a/package/libs/libpcap/Makefile
+++ b/package/libs/libpcap/Makefile
@@ -12,7 +12,8 @@ PKG_VERSION:=1.8.1
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=http://www.tcpdump.org/release/
+PKG_SOURCE_URL:=http://www.us.tcpdump.org/release/ \
+        http://www.tcpdump.org/release/
 PKG_HASH:=673dbc69fdc3f5a86fb5759ab19899039a8e5e6c631749e48dcd9c6f0c83541e
 PKG_FIXUP:=patch-libtool