[Piglit] [PATCH 2/2] Make shader_runner add a #version directive to shaders lacking one.

[Stuart Abercrombie]

I wondered about this case but it didn't come up with the subset I
tested with -- glad you caught it.

V2 looks good to me.  It's hard to be rigorous about detecting
#version directives without a real parser.  This seems a practical
compromise.

Stuart