glsl: Retire the non-NIR GLSL linking paths.
Now that we have only GLSL->NIR as a path in the frontend, we can rely on the NIR linking support. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8044>
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