[dx51] better caps code and fix last seen compilations problems

[Raphaël Junqueira]

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Hi all,

 I just come back to home and i can see a flood of message (maybe i see too 
many after too many drinks) ;(

 This patch must fix many of your problems with d3d8 compilation (why we can't 
have propers gl headers installed ? ;-( )
 
  I have tested it with headers from Eric Pouech, Rein Klazes and some others 
from net (nvidia, mesa, ...). 

  So please jason, can you complete the d3dcore_gl header to add the 
extensions definition you use and use it without using #ifdef/#endif (as i 
have done for dot3 support for exemple)

Regards,
Raphael
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