mesa: rework how we free gl_shader_program_data

When I introduced gl_shader_program_data one of the intentions was to
fix a bug where a failed linking attempt freed data required by a
currently active program. However I seem to have failed to finish
hooking up the final steps required to have the data hang around.

Here we create a fresh instance of gl_shader_program_data every
time we link. gl_program has a reference to gl_shader_program_data
so it will be freed once the program is no longer active.

Cc: "17.2 17.3" <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>
Reviewed-by: Neil Roberts <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102177

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