Use autopatch for new patches

Remove unused patch file, simplify adding a new patch. Just Patch: entry
is required with patch file name, autopatch will apply it.

Use new primary website for unbound upstream.

unbound-1.8.3-dns64-again.patch

@@ -1,11 +0,0 @@
-diff -Naur dns64/dns64.c dns64/dns64.c
---- dns64/dns64.c	2018-12-11 04:46:02.000000000 -0500
-+++ dns64/dns64.c	2018-12-12 12:39:30.589057421 -0500
-@@ -628,6 +628,7 @@
- 
- 	/* Store the response in cache. */
- 	if ( (!iq || !iq->started_no_cache_store) &&
-+		qstate->return_msg && qstate->return_msg->rep &&
- 		!dns_cache_store(qstate->env, &qstate->qinfo, qstate->return_msg->rep,
- 		0, 0, 0, NULL, qstate->query_flags))
- 		log_err("out of memory");

unbound.spec

@@ -36,8 +36,8 @@ Name: unbound
 Version: 1.9.6
 Release: 2%{?extra_version:.%{extra_version}}%{?dist}
 License: BSD
-Url: https://www.unbound.net/
-Source: https://www.unbound.net/downloads/%{name}-%{version}%{?extra_version}.tar.gz
+Url: https://nlnetlabs.nl/projects/unbound/
+Source: https://nlnetlabs.nl/downloads/%{name}/%{name}-%{version}%{?extra_version}.tar.gz
 Source1: unbound.service
 Source2: unbound.conf
 Source3: unbound.munin
@@ -156,10 +156,11 @@ Python 3 modules and extensions for unbound
 %global dir_primary %{pkgname}
 %endif
 
-%setup -qcn %{pkgname}
+%autosetup -c -N -n %{pkgname}
 
 pushd %{pkgname}
 # patches go here
+%autopatch -p1
 
 # only for snapshots
 # autoreconf -iv