Bug#885742: linsmith: GTK+ 3 / GooCanvas port may be available upstream

[Yavor Doganov]

I started working on this bug but fortunately discovered fairly
quickly that upstream is on the way of moving to GTK+ 3:

https://sourceforge.net/p/linsmith/discussion/389360/thread/90b515fb/#01e5/f302

You might want to check the status, it would be a pity if this package
has to be removed for buster.  Even if the port is not completely
finished, please encourage him to publish the work either as a VCS
branch or as a patch so that we can help get it done.