devel/re2c: Update to 2.2

Additional changes to submitted patch done by Corey Halpin (maintainer)
and Daniel Engberg (ports committer).

Changelog: https://github.com/skvadrik/re2c/blob/master/CHANGELOG

PR: 257966
Approved by: port maintainer, arrowd (mentor)
Differential Revision: https://reviews.freebsd.org/D32327