The API is soon two years old and deserves being shown as the primary
way to drive multi code as it makes it much easier to write code.
multi-poll: removed
multi-legacy: add to show how we did multi API use before
curl_multi_wait/poll.
Closes#7352
- also update two URLs outside of docs/examples
- fix spelling of filename persistant.c
- fix three long lines that started failing checksrc.pl
Closes https://github.com/curl/curl/pull/3036
... now with a -formadd suffix. While the new mime API is introduced in
7.56.0 we must acknowledge that lots of users can't upgrade their curl
versions immediately.