v2.3.8
Update IdnaTest.txt from Unicode 6.3.0 to 10.0.0.
maint: Run 'make my-update-copyright update-NEWS-hash'.
Silence perl uninitialized value warning.
tests: Add standalone.sh, fix things and use it. Seperation of IdnaTest.txt.
Mark U+19DA as DISALLOWED with Unicode 15.1.0.
Make (some) self-tests usable standalone using system libidn2. Closes: #97.
Fix -Werror=missing-variable-declarations.