Comment # 37 on bug 66067 from Nicholas Miell

You could look for "# cgc version" near the beginning of the program source
(almost certainly the second line), but that assumes the shaders weren't
post-processed to strip out all the comments.

Alternately, you could just disable it entirely by default and include a
driconf option.

The fact remains that the games work correctly on other OpenGL implementations
and are ancient enough that they're no longer supported and will never be
fixed.