package/nettle: switch _SITE to ftp.gnu.org

The former _SITE is not longer accessible without authentication.

The homepage is also unavailable, so use the one from the FSF directory.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
[yann.morin.1998@free.fr: also change the homepage]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/nettle/Config.in

@@ -7,4 +7,4 @@ config BR2_PACKAGE_NETTLE
 	  object-oriented languages, in applications like LSH or
 	  GNUPG, or even in kernel space
 
-	  https://www.lysator.liu.se/~nisse/nettle/
+	  https://directory.fsf.org/wiki/Nettle

package/nettle/nettle.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 NETTLE_VERSION = 3.8
-NETTLE_SITE = http://www.lysator.liu.se/~nisse/archive
+NETTLE_SITE = https://ftp.gnu.org/gnu/nettle
 NETTLE_DEPENDENCIES = gmp
 NETTLE_INSTALL_STAGING = YES
 NETTLE_LICENSE = Dual GPL-2.0+/LGPL-3.0+