winex11: fix palette conversion bug

[Roderick Colenbrander]

Hi,

This patch fixes a palette conversion bug in the game Nemesis (and
likely in Riven as well). In this case the game uploads 8-bit data to
a 16-bit physDev. When X runs at 24-bit the default 24-bit color
shifts result in a 24-bit colormap while for conversion a 16-bit
colormap is needed. In order to get a 16-bit colormap I'm passing the
color shifts to X11DRV_Palette_LookupPixel.

Regards,
Roderick Colenbrander
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