[dx8-9] Fix MIRROR_ARB compile problem

["Ann and Jason Edmeades" <us@the-edmeades.demon.co.uk>]

[Apologies if you receive multiple versions of this - it got 'stuck' in my
mailer

Changelog

o MIRROR_ARB support is not dependent on OpenGL 1.3 as I originally
ifdef'ed. It is apparently introduced fully in 1.4, or dependent on another
ifdef, GL_ARB_texture_mirrored_repeat

Jason

Attachment: dx8-9.mirrorfix.20030420.patch
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