[Wine] WoW - fix pixel shader flicker

[tparker]

I just did a fresh install of Wine (1.3.1) and World of Warcraft. The WoW 
in-game options interface has changed since the last time I needed to 
messed with settings and there is no longer a box to disable 
shadows/pixel shading. It is now a slider that can be moved to low but 
not turned off. This was causing an odd flickering of objects (walls, trees, 
etc.) where they would go back and forth from brightly lit to shaded very 
quickly. It also caused major graphics glitches in instances with lots of 
shading and lighting changes (such as Pit of Saron). 

This used to be fixed with disabling shading/shadows in the Wow 
options, with that box gone it can be fixed in winecfg -> graphics -> 
(uncheck) Allow Pixel Shader.  I didn't need to change anything in registry 
or manually edit any config files, just that winecfg change fixed it.

I wanted to mention it in case people coming back to the game for the 
new expansion search for the issue. I didn't see it on the appdb page 
but can't get an account to work to post it there, figured this was the next 
best option.