This was probably taken from the YUV shaders, incorrectly and in reverse
logic. It did happen to work though because fragment.texcoord[0].w is 1.0.

On high-resolution Retina displays, the OS X window backing store has twice the
pixels as Wine's window backing store.  So, our images get scaled up.  Core
Graphics had been interpolating/smoothing the image, which resulted in
fuzziness.  This tells it not to do that.

I had assumed this wouldn't be necessary since we pass FALSE for the
shouldInterpolate parameter of CGImageCreate() when we create the images.
Apparently, that's not sufficient.

msvcrt: Bump MSVCRT_MB_LEN_MAX to 5 and use it in MSVCRT__wctomb_l for default buffer lengthSet MB_LEN_MAX to 5 to match MSVCRT_MB_LEN_MAX.

The result is compared directly with handle type values like HANDLE_CONTEXT
whose meaningful values are in the high nibble.

When a window is being dragged, we prevent delivery of clicks to Wine.  We were
also preventing telling Wine that a window had been brought forward, but this
was incorrect.  It prevented clicks in the title bar from activating the window.