Log Message:
* Noteworthy changes in release 2.3.4 (2022-10-23) [stable]

** Support for Unicode 15.0.0.  Closes: #112.
We now uses Unicode.org's IDNA2008 tables rather than IANA's.  See
<https://gitlab.com/libidn/libidn2/-/issues/112> and
<https://lists.gnu.org/archive/html/help-libidn/2022-10/msg00000.html>
for rationale, which can be summarized into 1) IANA are still on
2019-era Unicode version 12 and we wish to support Unicode version
12-15, 2) consistency with some other implementations, 3) the only
incompatibility related to U+19DA is deemed to have minor real-world
consequences.  Thus we break backwards compatibility for U+19DA in
this release compared against libidn2 0.11..2.3.3 thus reverting back
to the libidn2 <= 0.11 behaviour.  We decided to not bump ABI version
and believe this is the best choice going forward as well for minor
internal non-API related ABI changes.

** Gnulib updated and now libunistring-optional is used.
This allows you to force libidn2 to use internal libunistring with the
following command: ./configure --with-included-libunistring