message: Fix odd linux compile error in tests
diff: @@ -73,11 +73,14 @@ void main()
  {
  void *ctx;
  - std::atomic_bool rendering = true;
  + std::atomic_bool rendering;
  GLuint VB, VAO, prog, FBO, tex;
  } A, B;
  + A.rendering = true;
  + B.rendering = true;
  +
  A.VB = MakeBuffer();
  glBindBuffer(GL_ARRAY_BUFFER, A.VB);
  glBufferStorage(GL_ARRAY_BUFFER, sizeof(RedTri), RedTri, 0);
  @@ -114,7 +117,8 @@ void main()
  A.ctx = MakeContext(mainWindow, mainContext);
  B.ctx = MakeContext(mainWindow, mainContext);
  - std::atomic_bool quit = false;
  + std::atomic_bool quit;
  + quit = false;
  auto windowThread = [&](int idx) {
  ctxdata &ctx = (idx == 0 ? A : B);
  