Blame the right Windows header for these insane defines.

Everyone is fired.
Use non-default initial clear color in Renderer.

Set it to some non-trivial value to achieve these two things:

 * Some "corporate identity", I find very dark gray nicer than pure
   black.
 * Easier "black screen" debugging. Native Client, for example, by
   default clears to pure white, which caused me painful hours figuring
   out what the hell is going on.