Add the upstream patch mentioned in the source as directed in ubuntu bug

https://bugs.launchpad.net/ubuntu/+source/irssi-plugin-otr/+bug/1579548
 Fixes No 24166

helpers/make-irssi-plugin-otr

+#!/bin/sh
+#
+#    Copyright (C) 2018 Andrew M. Lindley <andrew@andrewlindley.co.uk>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+VERSION=1
+
+. ./config
+
+cat >>src/module.c <<EOF
+
+#ifdef IRSSI_ABI_VERSION
+/*
+ * irssi abicheck()
+ * From https://github.com/cryptodotis/irssi-otr/commit/d03ab59b6f27142c1c5e99fedc635a589b1607bb
+ */
+void otr_abicheck(int *version)
+{
+	*version = IRSSI_ABI_VERSION;
+}
+#endif
+EOF
+
+changelog "Added upstream commit to enable otr plugin #24166"
+
+compile
+