glcpp: Reject #version after the version has been resolved.
glcpp: Reject #version after the version has been resolved.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74166
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Reviewed-by: Carl Worth <3966d6ecbaaa47b45708b84fc68464c10c40d492@cworth.org>

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