Log Message:
enchant2: update to 2.2.12.

2.2.12 (October 15, 2020)
-------------------------

Fix a bug in the Voikko and Zemberek back-ends that could cause spell
checking and suggestion to fail. (For programmers: enchant_dict_check and
enchant_dict_suggest allow counted strings, but those two backends were
assuming the strings were NUL-terminated.)