- add fix-testsuite-failures-with-autoconf270.patch to fix compatibility
with autoconf 2.70

- update to 1.16.3:
- In the testsuite summary, the "for $(PACKAGE_STRING)" suffix
can be overridden with the AM_TESTSUITE_SUMMARY_HEADER variable.
- 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.
- new variable AM_DISTCHECK_DVI_TARGET, to allow overriding the
"make dvi" that is done as part of distcheck.
- 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.
- rename automake-SuSE.patch to automake-suse-vendor.patch and refresh
- remove automake-testsuite-vala-gcc10.patch (upstream)