3/3 winex11: add support for dibsections at more depths when XRender is around

[Roderick Colenbrander]

Hi,

This patch adds support for dibsections at some additional depths like
16-bit/32-bit in case the desktop runs at 24-bit. This fixes some bugs
in which the alpha channel got lost and second this moves depth
conversion (e.g. when blitting a 16-bit dibsection to a 24-bit window)
to the Xserver. The patch has been tested using a bunch of gdi32
bitmap tests by Joel (unmerged) and using C&C Tiberian Sun which uses
16-bit.

Regards,
Roderick Colenbrander
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