Subsurface and gtk 3.0

[Peter Suetterlin]

  Hi Lubomir,


Lubomir I. Ivanov wrote:
> 
> hello,
> this patch would work (using gtk_show_about_dialog()), but it breaks
> the about dialog url hooks on Mac and Windows builds.
> g_object_set() with G_OBJECT (instead of GTK_OBJECT) should be used.
> 
> that code your are changing was last modified by me and i never got a
> GTK3 setup to test it with, TBH.

Thanks a lot!  Yes, this works nicely here with GTK3 :D

  Pit