message: fix typo where not all requested draw buffers would be cleared
  we were not handling drawbuffers 4 to 7.
diff: @@ -3003,6 +3003,18 @@ void OpenGLDriver::clearWithRasterPipe(TargetBufferFlags clearFlags,
  if (any(clearFlags & TargetBufferFlags::COLOR3)) {
  glClearBufferfv(GL_COLOR, 3, linearColor.v);
  }
  + if (any(clearFlags & TargetBufferFlags::COLOR4)) {
  + glClearBufferfv(GL_COLOR, 4, linearColor.v);
  + }
  + if (any(clearFlags & TargetBufferFlags::COLOR5)) {
  + glClearBufferfv(GL_COLOR, 5, linearColor.v);
  + }
  + if (any(clearFlags & TargetBufferFlags::COLOR6)) {
  + glClearBufferfv(GL_COLOR, 6, linearColor.v);
  + }
  + if (any(clearFlags & TargetBufferFlags::COLOR7)) {
  + glClearBufferfv(GL_COLOR, 7, linearColor.v);
  + }
  if ((clearFlags & TargetBufferFlags::DEPTH_AND_STENCIL) == TargetBufferFlags::DEPTH_AND_STENCIL) {
  glClearBufferfi(GL_DEPTH_STENCIL, 0, depth, stencil);
  