Updates to glext unit to support OpenGL 2.0

Original Reporter info from Mantis: Michalis @michaliskambi

Reporter name: Michalis Kamburelis

Description:

I sent a mail to fpc-devel with a patch to update FPC glext unit. The mail is archived here: http://lists.freepascal.org/lists/fpc-devel/2006-October/009067.html

I'm also attaching the same patch to this report, as it seems not possible to extract the attachment from mailing list archive.

Mantis conversion info:

Mantis ID: 7600
Fixed in version: 2.2.0
Fixed in revision: 4884 (#9ea736e8)

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