gawk: Update to version 5.3.0

gawk: Update to version 5.3.0

- Update from version 5.2.2 to 5.3.0
- Update of rootfile
- Changelog
    5.3.0
	1. Infrastructure changes: Removed the use of libsigsegv. The
	   value-add was never very much and it caused problems in some
	   environments.
	2. In keeping with new features in BWK awk, gawk now has built-in
	   CSV file parsing. The behavior is intended to be identical to
	   that of the "One True AWK" when --csv is applied. See the
	   manual for details.
	3. Also in keeping with BWK awk, gawk now supports a new \u escape
	   sequence. This should be followed by 1-8 hexadecimal digits. The
	   given code point is converted to its corresponding multibyte encoding
	   for storage inside gawk. See the manual.
	4. If PROCINFO["BUFFERPIPE"] exists, then pipe output is buffered.
	   You can also use PROCINFO["command", "BUFFERPIPE"]. See the manual
	   for details.
	5. Because of the additional `do_csv' variable in the API, which breaks
	   binary compatibility, the API major version was updated to 4 and
	   the minor version was reset to zero.  The API remains source code
	   compatible; that is, existing extensions should only require recompilation.
	6. The manual now requires Texinfo 7.1 and its texinfo.tex for formatting.
	   As a result, we no longer need to pre-process it, removing the need
	   for gawktexi.in and leaving just gawk.texi.
	7. And of course, there have been several minor code cleanups and bug fixes.
	   See the ChangeLog for details.
    5.2.x
	1. The readdir extension has been updated with additonal code and
	   features, see the manual or its man page. As a result, the
	   readdir_test.c extension has been removed.
	2. We have a new translation: Ukranian.
	3. Several subtle issues related to null regexp matches around
	   multibyte characters have been fixed.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>