Convert 565 to 0888

[Einars]

I had graphical problems with an online game called Angels Online, when
just a black screen was visible, and complaints about missing converter
from  WINED3DFMT_R5G6B5 to WINED3DFMT_X8R8G8B8, so I added a converter
for this format, and the game runs flawlessly now on wine, the 1.1.1
release as well as git version (at least for me). I hope this was the
right way to fix it.

Kind regards,

Einars Lielmanis