The maximum size of the name returned by Stat() on a top-level storage has
nothing to do with DIRENTRY_NAME_BUFFER_LEN. Windows can return longer names
and probably has a limit of MAX_PATH. Also, Stat always returns an absolute
pathname, so we don't need a special case in StgOpenStorage.

Fixes stack corruption in the 64-bit tests. Thanks to Paul Vriens for debugging this.

This makes it consistent with dxgi_adapter.

This fixes a regression introduced by 2b2fc827.

Found by Valgrind.

If the surface is part of a texture it doesn't keep its own reference to the
device, but instead relies on the reference the texture has. This fixes a
regression introduced by ff92e6eb.

If the surface is part of a texture it doesn't keep its own reference to the
device, but instead relies on the reference the texture has. This fixes a
regression introduced by 3cedef2f.

This is needed because the window(and thus the GL drawable) might be
smaller than the D3D backbuffer. If we waited for the FBO switch until
Present is called we'd lose data in the first frame.

This is used by the offscreen render target->texture blit code if
FBOs are enabled, but FBO_blit is not supported