less: Update to version 643

less: Update to version 643

- IPFire-3.x
- Update from version 608 to 643
- Changelog
    643
	    Fix problem when a program piping into less reads from the tty, like sudo asking for password (github #368).
	    Fix search modifier ^E after ^W.
	    Fix bug using negated (^N) search (github #374).
	    Fix bug setting colors with -D on Windows build (github #386).
	    Fix reading special chars like PageDown on Windows (github #378).
	    Fix mouse wheel scrolling on Windows (github #379).
	    Fix erroneous EOF when terminal window size changes (github #372).
	    Fix compile error with some definitions of ECHONL (github #395).
	    Fix crash on Windows when writing logfile (github #405).
	    Fix regression in exit code when stdin is /dev/null and output is a file (github #373).
	    Add lesstest test suite to production release (github #344).
	    Change lesstest output to conform with automake Simple Test Format (github #399).
    633
	    Add LESSUTFCHARDEF environment variable (github #275).
	    Add # command (github #330).
	    Add ^S search modifier (github #196).
	    Add --wordwrap option (github #113).
	    Add --no-vbell option (github #304).
	    Add --no-search-headers option (github #44).
	    Add --modelines option (github #89).
	    Add --intr option (github #224).
	    Add --proc-backspace, --proc-tab and --proc-return options (github #335).
	    Add --show-preproc-errors option (github #258).
	    Add LESS_LINES and LESS_COLUMNS environment variables (github #84).
	    Add LESS_DATA_DELAY environment variable (github #337).
	    Allow empty "lines" field in --header option.
	    Update Unicode tables.
	    Improve ability of ^X to interrupt F command (github #49).
	    Status column (-J) shows off-screen matches.
	    Parenthesized sub-patterns in searches are colored with unique colors, if supported by the regular expression library (github #196).
	    Don't allow opening a tty as file input unless -f is set (github #309).
	    Don't require newline input after +&... option (github #339).
	    Fix incorrect handling of some Private Use Unicode characters.
	    Fix ANSI color bug when overstriking with colored chars (github #276).
	    Fix compiler const warning (github #279).
	    Fix signal race in iread (github #280).
	    Fix reading procfs files on Linux (github #282).
	    Fix --ignore-case with ctrl-R (no regex) search (github #300).
	    Fix bug doing repeat search after setting & filter (github #299).
	    Fix bug doing repeat search before non-repeat search.
	    Fix crash with -R and certain line lengths (github #338).
	    Fix input of Windows dead keys (github #352).
	    Don't retain search options from a cancelled search (github #302).
	    Don't call realpath on fake filenames like "-" (github #289).
	    Implement lesstest test suite.
	    Convert function parameter definitions from K&R to C89 (github #316).

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