Set version 1.6.1 (release 2), and update RPM packaging.

Unfortunately I didn't think ahead, and left no room in the version
numbering between 1.6.1 (for Varnish 6.1) and 1.6.2 (for 6.2). So
the package for this version will be released as 1.6.1-2. But now
we have more than one version in the history that announces itself
as 1.6.1.

The RPM spec strictly requires Varnish 6.1.

configure.ac

 AC_PREREQ([2.68])
-AC_INIT([libvmod-re2], [trunk], [varnish-support@uplex.de], [vmod-re2])
+AC_INIT([libvmod-re2], [1.6.1], [varnish-support@uplex.de], [vmod-re2])
 AC_COPYRIGHT([Copyright 2016-2017 UPLEX - Nils Goroll Systemoptimierung])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])

pkg/rpm/vmod-re2.spec

@@ -10,11 +10,11 @@ URL: https://code.uplex.de/uplex-varnish/libvmod-re2
 Source0: %{name}-%{version}.tar.gz
 
 # varnish from varnish61 at packagecloud
-# This is the Requires for VMOD ABI compatibility with VRT >= 8.0.
-Requires: varnishd(vrt)%{?_isa} >= 8
+# This is the Requires for VMOD ABI compatibility with VRT 8.
+Requires: varnishd(vrt)%{?_isa} >= 8, varnishd(vrt)%{?_isa} < 9
 Requires: re2 >= 20150501
 
-BuildRequires: varnish-devel >= 6.1.0
+BuildRequires: varnish-devel >= 6.1.0, varnish-devel < 6.2.0
 BuildRequires: re2-devel >= 20150501
 BuildRequires: pkgconfig
 BuildRequires: make
@@ -75,7 +75,10 @@ rm -rf %{buildroot}
 /sbin/ldconfig
 
 %changelog
-* Mon Dec 3 2018 Geoff Simmons <geoff@uplex.de> - 1.6.1
+* Mon Aug 26 2019 Geoff Simmons <geoff@uplex.de> - 1.6.1-2
+- Add integers associated with set elements, for Varnish 6.1
+
+* Mon Dec 3 2018 Geoff Simmons <geoff@uplex.de> - 1.6.1-1
 - True dependency on VRT 8.0, compatible with Varnish 6.1, libvarnishapi.so.2
 
 * Fri Nov 30 2018 Geoff Simmons <geoff@uplex.de> - 1.5.2