[Bug 6900] WoW Crash when try to change graphics settings in opengl mode

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=6900

------- Additional Comments From [e-mail]  2007-30-03 19:49 -------
Created an attachment (id=5570)
 --> (http://bugs.winehq.org/attachment.cgi?id=5570&action=view)
patch try 1

So.. seems like WoW requires offscreen pixelformats. Even with the old code, if
I commented out initialization of offscreen pixelformats, WoW crashed.
What's the reason to not provide offscreen pixelformats?

This patch does two things:
 - init_formats() initializes offscreen pixelformats.
 - ConvertPixelFormatWGLtoGLX() _needs_ to set '*fmt_count' even if
iPixelFormat is invalid (because of X11DRV_wglGetPixelFormatAttribivARB()).