Log Message:
Update enchant2 to 2.2.8.

2.2.8 (February 27, 2020)
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Add a provider back-end for Nuspell (thanks, Sander van Geloven). Nuspell is
a new spell-checker whose development has been supported by the Mozilla
foundation. It is backwards-compatible with Hunspell and Myspell
dictionaries, while supporting a wider range of language peculiarities,
improved suggestions, and easier maintainability of the code-base.

Doxygen documentation generation is now supported for Enchant (thanks,
Sander van Geloven).

The command-line parsing of the “enchant” program has been made more
friendly and reliable. The -L flag (show line numbers), which had not been
working for some time, has been fixed.

A buffer overflow in personal wordlist handling has been fixed.

Minor improvements were made to the tests (thanks, Sander van Geloven).