Reduce the dependency footprint of shp2pgsql-gui

[robe]

If I am not mistaken -- it seems that I have to practically include all of the gtk_bundle bin (at least on windows), for the shp2pgsql-gui to work on a machine without a gtk install.

I hate doing this because -- first -- thats a lot of dlls to package and I suppose I could put it in a separate folder, and add that to path, but then I could mess up some poor sap's application who depends on a different version of gtk.

I don't want to clutter the PostgreSQL bin folder with all of these either for obvious reasons.