add libcurl integration using curl_multi_socket_action

[wez]

Make it easy to create a multi-handle that is wired up to our event handling.

[kev009]

I'm working on porting a basic example like https://github.com/nikhilm/uvbook/blob/master/code/uvwget/main.c to libphenom. I'll add a link to my results here when ready.

[ghost]

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