[LV2] X11 in Gtk3

[David Robillard]

Hi all,

I've added X11 in Gtk3 support to Suil in git, if anyone wants to tinker
with that.  It's just a simple modification from the Gtk2 one which
seems to work for me at first glance...

http://git.drobilla.net/cgit.cgi/suil.git/commit/?id=80e9c5717d7a68e3a03640de84e36390caa21cbe

We'll need to get native UIs working in Gtk3 for hosts to realistically
be able to use/migrate to Gtk3, but I have no idea what that situation
will be like on the other platforms...

-- 
dr