gftp-gtk.c: CreateConnectToolbar: avoid GtkHandleBox in GKT3 (#88)
gftp-gtk.c: CreateConnectToolbar: avoid GtkHandleBox in GKT3 (#88)

GtkHandleBox was deprecated in GTK 3.4, and it seems it got broken at some point..
it doesn't work on macOS.

merges and closes #88

masneyb/gftp,masneyb/gftp