Round 3 of remove unused functions from src/libudev/{conf-files,hashmap,util}

The following functions were removed:
  strv_env_get_n
  strv_env_get
  conf_files_list
  hashmap_remove
  hashmap_move
  log_dump_internal
  parse_uid
  read_full_file
  strstrip
  file_in_same_dir
  cunescape
  cunescape_length
  cunescape_length_with_prefix
  xescape
  dirent_is_file
  close_all_fds
  read_one_char
  ask
  reset_terminal_fd
  reset_terminal
  flush_fd
  loop_read
  get_ctty_devnr
  get_ctty
  rm_rf_children
  rm_rf_children_dangerous
  rm_rf
  status_vprintf
  fd_columns
  columns
  fd_lines
  lines
  on_tty
  ellipsize
  ellipsize_mem
  touch
  unquote
  resolve_dev_console
  tty_is_vc
  vtnr_from_tty
  terminal_vhangup_fd
  terminal_vhangup
  file_is_priv_sticky
  signal_from_string
  fd_wait_for_event
  memdup
  memdup_multiply

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>