mesa: add bool param to _mesa_free_context_data

The param controls whether _mesa_destroy_debug_output should be called or not.
No functional changes; this will be used by the next commit.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5789>
9 files changed