[2/2] windowscodecs: Implement CreateBitmapFromHICON, based on a gdiplus implementation.

[Vincent Povirk]

You appear to be leaking the IWICBitmapLock object.

Also, it seems odd that you're using the buffer AND IWICBitmapLock. I
assume the point of passing a buffer to BitmapImpl_Create (and wasting
a bit of time/memory) was to avoid IWICBitmapLock.