pidgin/pidgin

Install our appdata file to $(datadir)/metainfo as that change was made a long time ago

This patch originates from Lars Wendler from Gentoo

https://gitweb.gentoo.org/repo/gentoo.git/commit/net-im/pidgin/files/pidgin-2.13.0-metainfo.patch?id=2dd6c1852251b5b67c3045badf173be9535b97a9

Testing Done:
Installed to a prefix and verified the file ended up in `$prefix/share/metainfo`

Reviewed at https://reviews.imfreedom.org/r/607/
/** @page dbus-server-signals DBus Server Signals
@signals
@signal dbus-method-called
@signal dbus-introspect
@endsignals
@see dbus-server.h
<hr>
@signaldef dbus-method-called
@signalproto
gboolean (*dbus_method_called)(DBusConnection *connection,
DBusMessage *message);
@endsignalproto
@signaldesc
Emitted when a dbus method is going to be called.
@param connection The DBus connection.
@param message The DBus message.
@return TRUE if signal handler handled the method. ???
@endsignaldef
@signaldef dbus-introspect
@signalproto
void (*dbus_introspect)(GList **bidings_list);
@endsignalproto
@signaldesc
???
@param bindings_list ???
@endsignaldef
*/
// vim: syntax=c.doxygen tw=75 et