Fix compilation warnings from gcc 4.6.

Fix compilation warnings from gcc 4.6.

src/chanserv.c (zoot_list): Delete this function.
  (cmd_invite): Remove never-read uData variable.
  (ban_read_helper): Remove never-read bData variable.
src/helpfile.c (vsend_message): Remove never-read expand_pos variable.
src/ioset.c (ioset_buffered_read): Remove never-read fdnum variable.
src/log.c (log_entry_search): Remove never-read last variable.
src/mod-helpserv.c (cmd_add_user): Remove never-read new_user variable.
src/modcmd.c (check_alias_args): Remove never-read tmp variable.
src/nickserv.c (cmd_reclaim): Remove never-read hi variable.
src/proto-p10.c (cmd_topic): Remove never-read chan_ts variable.
  (AddLocalUser): Remove never-read timestamp variable.