Update to 3.3.39
    
    - New upstream release 3.3.39
      - Fixed relative pathnames when generated in MinGW and used back on Linux
      - Added --output filename option to fst2vcd, vzt2vcd, and lxt2vcd
      - Fixed crash on OSX if gtk_widget_set_sensitive is called on a separator
      - Fixed OSX version so it looks for .gtkwaverc in the home directory and if
        not found, probes the resource bundle for
        Contents/Resources/examples/gtkwaverc (no dot in the name)
      - Added GTKWave User's Guide option to help menu on OSX
      - Added + vs ++ separators for twinwave
      - Dynamic resize fixes