MINOR: dynbuf: use regular lists instead of mt_lists for buffer_wait

There's no point anymore in keeping mt_lists for the buffer_wait and
buffer_wq since it's thread-local now.

(cherry picked from commit 90f366b59556f9e64c927286bfc8e9c06d511744)
Signed-off-by: Willy Tarreau <w@1wt.eu>
12 files changed