Some failures are temporary, for example if the user reconfigures their
audio setup while playing audio. Returning 0 could have bad "going
backward in time" effects which can break audio even after the call
starts to succeed again.

Found by Andrew Eikum.

winemac: Take WS_EX_TOOLWINDOW into account when computing how much of a window is replaced by the Mac decorations.

wined3d: Merge surface_bind_and_dirtify() and volume_bind_and_dirtify() into wined3d_texture_bind_and_dirtify().

winemac: Defer attaching OpenGL context to a view which is zero-sized or outside its window's bounds.

That fails with the dread "invalid drawable" message.

It has a non-object pointer from the caller, so it can't allow the caller
to continue until it's finished with it.  Also, it discards events from the
event queue and we don't want the caller to process them first.

Fixes brokenness introduced by 784a9139.