Samba4: Rework URLs

Avoid Hetzner hosted servers due to availability (.ru users)
and try to keep availability as good as possible without
sacrificing performance for the majority of users.
Update upstream project download URL

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

net/samba4/Makefile

@@ -9,12 +9,12 @@ PKG_MAINTAINER:=Andy Walsh <andy.walsh44+github@gmail.com>
 PKG_LICENSE:=GPL-3.0-only
 PKG_LICENSE_FILES:=COPYING
 
-PKG_SOURCE_URL:=https://fossies.org/linux/misc/ \
-				ftp://mirrors.dotsrc.org/samba/ \
-				https://ftp.gwdg.de/pub/samba/stable/ \
-				https://ftp.yz.yamagata-u.ac.jp/pub/network/samba/ \
-				http://ftp.uni-bayreuth.de/netsoftware/samba/ \
-				https://www.samba.org/ftp/samba/stable/
+PKG_SOURCE_URL:=https://ftp.heanet.ie/mirrors/ftp.samba.org/stable/ \
+		https://ftp.gwdg.de/pub/samba/stable/ \
+		https://ftp.riken.jp/net/samba/samba/stable/ \
+		http://www.nic.funet.fi/index/samba/pub/samba/stable/ \
+		http://samba.mirror.bit.nl/samba/ftp/stable/ \
+		https://download.samba.org/pub/samba/stable/
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_HASH:=c9205a651a83d69e200fec9dd65e9fa360f0c75ab3275b3dcb74e5cbaec60807