ddraw: complete recognition of pixelformat 19: X8L8V8U8

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

the argument for including this code is based on symmetry: Every place in the Wine
source tree (incl. ddraw, d3d9, wined3d) that handles L6V5U5 also handles X8L8V8U8 -- except for these two places.  So I closed the gap.

This fixes
err:ddraw:PixelFormat_WineD3DtoDD Can't translate this Pixelformat 19
Please see bug #16559 for further discussion.

Being based on the symmetry argument means this patch is completely independent on
possible missing conversions between D3DFMT and WINED3DFMT codes somewhere in Wine.
I would not eliminate that possibility.  The above error message that
used to mention Pixelformats 62/63/64 nowadays mentions 19/64/69/70.

Regards,
 Jörg Höhle
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