gallium/hash_table: turn it into a wrapper around util/hash_table

Replace a lot of code duplication by making it use struct hash_table instead.

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
Part-of: <https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/976>
1 file changed