Log Message:
Update enchant2 to 2.3.0

2.3.0 (June 14, 2021)
---------------------

Add -p flag to enchant.

Allow personal wordlist APIs (enchant_pwl_*) to take -1 as the length of the
word, as the enchant_dict_* APIs already allowed.

Add documentation to enchant_provider.h.

Make Aspell the default backend for English locales it supports, as it is
much quicker than Hunspell in this case and achieves slightly better
results.

Require nuspell version 4.1.0 or later.