[RFC][Discussion] Add curl_multi_errno(), curl_share_errno() and curl_share_strerror()

Hi Internals, I would like to introduce 3 new functions to ext/curl - curl_multi_errno() - curl_share_errno() - curl_share_strerror() With those 3 functions added, it will now be possible to get any error that curl detect on any of the curl resource types and the error message associated to it. https://wiki.php.net/rfc/new-curl-error-functions Feedback and questions are welcome. Pierrick