Fixes a bug valgrind found.

    
This essentially reverts 2f69329a.
We really need the visible rect to be set atomically with the rest of
the window position info.

Also avoid dependency on winternl.h.

widl: Consolidate top-level parameter conformance/variance expression writing into a separate function.

Descend through as many pointer types as necessary to find the
fundamental type and determine whether it needs a top-level parameter
conformance/variance expression to be written.

Add support for writing top-level parameter conformance/variance
expressions for non-encapsulated unions.

This gets rid of depth_copy_state in the device, and instead tracks
the most up to date location per-surface. This makes things a lot
easier to follow, and allows us to make a copy when switching depth
stencils in SetDepthStencilSurface().

This makes the depth copy independent of the currently attached render
targets. This is important for the next patch because it might do a
depth copy when the render targets aren't in a valid configuration
(SetDepthStencilSurface()).

wined3d: Make sure the FBO doesn't have any depth attachments in color_fill_fbo() and stretch_rect_fbo().

Currently this is already true, but the next patch will break that assumption.