libidn: Update to version 1.38

libidn: Update to version 1.38

- Update from 1.36 to 1.38
- Update of rootfile
- Changelog
    version 1.38
	build: Fix --disable-tld builds.
        Simplify building of gdoc-generated man/texi outputs.
        Rebuild GTK-DOC HTML/PDF outputs on version number changes.
        doc: Rebuild idn.1 when version number changes.
        build: Fix --disable-tld builds.
        cicd: Add pages.
        doc: Improve GTK-DOC manual.
        cicd: Fix Ubuntu 12.04 builds.
        Improve GTK-DOC manual.
        Fix build errors related to doc/idn--help.texi.
        doc: Fix release process.
        doc: Improve HACKING instructions.
        Bootstrap cache.
    version 1.37
        Use gnulib's bootstrap.
        Drop old unused WERROR_CFLAGS usage.
        Improve URLs.
        Fix links for git and valgrind.
        Fix self check for --disable-tld.
        Sync with TP.
        Doc fixes.
        Don't dist ps/html/pdf.  Drop custom css.
        Improve ./configure summary output.
        Use gnulib langinfo module.
        More ./configure summary output.
        Use AM_GNU_GETTEXT_VERSION to get intl.m4 too.
        Disable some complex gnulib self-tests that add lots of dependencies and fail on mingw.
        Drop second gnulib tests directory since only one is supported.
        Require more recent automake and gtk-doc.
	Fix .gitignore.
        doc: Fix JDK dependency for Fedora.
        Drop warning stuff covered by manywarnings.m4 now.
        Disable VLA from gettext.
        Remove autopoint-generated files that are in gnulib too.
        Update autoconf archive macros.
        Prefer gnulib's M4 files over autopoint.
	Modernize autoconf usage.
        Use AM_GNU_GETTEXT_REQUIRE_VERSION.
	Update gnulib files.
        Modernize configure.ac.
	Require autoconf 2.64 for newer gnulib.
        Avoid including copyright info in idn example.
        Fix manual copyright years.
        Fix syntax-check.
        Update copyright years.
        Improve HACKING.
        Drop obsolete PGP key from AUTHORS.
        Revert last patch, clearly src/ was being built before doc/.
        Build doc/ after src/ so that src/idn exists for help2man of doc/idn.1.
        Fix recommended package installs.
        Drop .gitlab-ci.yml.
        Doc fix.
        Sync with TP.
        Fix typos, inspired by codespell.

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