mix_pam: Add the get-roster patch

0000-add-roster-get-event.patch

@@ -0,0 +1,11 @@
+diff -r 8a29e7206917 plugins/mod_roster.lua
+--- a/plugins/mod_roster.lua	Sun Oct 25 15:23:36 2020 +0100
++++ b/plugins/mod_roster.lua	Mon Nov 02 17:09:21 2020 +0100
+@@ -57,6 +57,7 @@
+ 			end
+ 			roster.tags[1].attr.ver = server_ver;
+ 		end
++        if module:fire_event("roster-get", { session = session, stanza = stanza }) then return; end
+ 		session.send(roster);
+ 		session.interested = true; -- resource is interested in roster updates
+ 	else -- stanza.attr.type == "set"