[D3D8 - 0] the number begin: new x11drv/GLX stuff [resend]

[Raphaël Junqueira]

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Hi,

 This stuff is needed by the future D3D8 patches so it's numbered 0 ;)
This have been developed with ddraw people and maybe they'll need it ;)

Changelog:
  - add a call to x11drv::ExtEscape to get openGL infos (extensions and caps) (only filled once at first call)
  - define in x11drv: 
        - X11DRV_OPENGL_INFO struct
        - typedefs, if not defined by glext.h, for the extensions functions
        - X11DRV_OPENGL_SUPPORTED_EXT enum for d3d* needs extensions 


 Raphael
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