less: Update to version 581

less: Update to version 581

- Update from 563 to 581
- Update of rootfile not required
- Changelog
    Change ESC-u command to toggle, not disable, highlighting per man page.
    Add ESC-U command.
    Add ctrl-W search modifier for wrapping search.
    F command can be interrupted by ^X.
    Support OSC 8 hyperlinks when -R is in effect.
    g command with no number will ignore -j and put first line at top of screen.
    Multiple + or -p command line options are handled better.
    Add the --incsearch option.
    Add the --line-num-width option.
    Add the --status-col-width option.
    Add the --use-color and --color options.
    Display -w highlight even if highlighted line is empty.
    If search result is in a long line, scroll to ensure it is visible.
    Editing the same file under different names now creates only one entry in the file list.
    Make visual bell more visible on some terminals.
    Ring end-of-file bell no more than once per second.
    Build can use either Python or Perl for Makefile.aut operations.
    Fix crash when using the @ search modifier.
    Fix crash in the 's' command due to duplicate free.
    Fix realpath crash on Darwin.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>