Upgrade IDNA Tables from Unicode 11 to 12
Upgrade TR46 Tables from Unicode 13 to 14
Updated gnulib files and various build fixes
Gnulib's Unicode code claims conformance to Unicode 14.0.0 rather than Unicode 9.0.0. A bug in Libidn2's build system was fixed that caused the system libunistring to be used even though the system version was too old.
Self-checks for the idn2 command line tool were added. The C self-checks in
tests/ should now be usable outside of the libidn2 build environment, for system integration checks of a system-installed libidn2.
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