www/cutelyst: update to 3.5.0, relicense

Cutelyst has been re-licensed as BSD-3-Clause, see
https://dantti.wordpress.com/2022/07/18/cutelyst-v3-5-relicensed-as-bsd-3-clause/
There was no 3.4 release. Aside from the re-licensing, the major
thing this time is start/stop support when embedded.