Merge branch '3997_cleanup'

Merge branch '3997_cleanup'

* 3997_cleanup:
  Do not include <sys/select> globally via "lib/global.h".
  (mc_symlink): test vpath2 before use.
  lib/vfs/interface.c: fix coding style.
  (display_bits_box): use tty_display_8bit().
  (panel_options_box): don't apply integer value to boolean variable.
  (edit_files): fix shadow of variable declaration.
  mcviewer: clarify of HAVE_CHARSET usage.
  Replace [] in AS_HELP_STRING.
  (setup_panels): fix origin and size of panels.
  (vfs_stamp_compare): fix NULL dereference.
  (ftpfs_dir_load): minor refactoring.
  Make VFS faster a bit.
  (vfs_s_normalize_filename_leading_spaces): minor refactoring.
  (history_show): fix order of history items.
  urar extfs: don't start path with ./ in file list.
  Ticket #3997: code clean up before 4.8.24 release.