automake: Update to 1.16.3

automake: Update to 1.16.3

- Update automake from 1.16.2 to 1.16.3
- No change to rootfile
- New in 1.16.3:
	* New features added
	  - In the testsuite summary, the "for $(PACKAGE_STRING)" suffix
	    can be overridden with the AM_TESTSUITE_SUMMARY_HEADER variable.
	* Bugs fixed
	  - Python 3.10 version number no longer considered to be 3.1.
	  - Broken links in manual fixed or removed, and new script
	    contrib/checklinkx (a small modification of W3C checklink) added,
	    with accompany target checklinkx to recheck urls.
	  - install-exec target depends on $(BUILT_SOURCES).
	  - valac argument matching more precise, to avoid garbage in DIST_COMMON.
	  - Support for Vala in VPATH builds fixed so that both freshly-generated and
	    distributed C files work, and operation is more reliable with or without
	    an installed valac.
	  - Dejagnu doesn't break on directories containing spaces.
	* Distribution
	  - new variable AM_DISTCHECK_DVI_TARGET, to allow overriding the
	    "make dvi" that is done as part of distcheck.
	* Miscellaneous changes
	  - install-sh tweaks:
	    . new option -p to preserve mtime, i.e., invoke cp -p.
	    . new option -S SUFFIX to attempt backup files using SUFFIX.
	    . no longer unconditionally uses -f when rm is overridden by RMPROG.
	    . does not chown existing directories.
	  - Removed function up_to_date_p in lib/Automake/FileUtils.pm.
	    We believe this function is completely unused.
	  - Support for in-tree Vala libraries improved.
- Full change details are in ChangeLog file in tarball

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