[02/10] windowscodecs: Reimplement QueryCapability of the BMP decoder.

[Vincent Povirk]

Does QueryCapability really initialize the decoder? Can you get a
frame out of it? I guess it never occurred to me to try.

I was OK with this for the other implementations because I figured
it'd be easy enough to invalidate the decoder after successfully
calling Initialize, if that turned out to be a problem.