message: add sdl gl hints
diff: @@ -282,6 +282,8 @@ impl GraphicsContext {
  gl.set_green_size(5);
  gl.set_blue_size(5);
  gl.set_alpha_size(8);
  + gl.set_multisample_buffers(1);
  + gl.set_multisample_samples(4);
  let mut window_builder = video.window(window_title, screen_width, screen_height);
  if window_mode.resizable {
  window_builder.resizable();
  @@ -317,7 +319,8 @@ impl GraphicsContext {
  &set,
  gfx::Primitive::TriangleList,
  rasterizer,
  - pipe::new())?;
  + pipe::new()
  + )?;
  let rect_inst_props = factory
  .create_buffer(1,
  