• [Windows] Fixed left trigger not working using XInput controllers
  (Thanks to Pcegames for report and testing).
• [Windows] Fix to accept up/right D-Pad inputs in controller setup on
  some conditions (Thanks to SatoXa for report and testing).
• [Linux] Use the 'MEDNAFEN_HOME' environment variable when
  it is set (Patch by denisfa).
• Some minor fixes.