pidgin/pidgin

Remove network listener code.

2020-12-18, Elliott Sales de Andrade
ae3652f5ca05
Remove network listener code.

* Remove network listener code.
* Inline `purple_network_get_port_from_fd` to its one caller.

Testing Done:
Compile only; all callers have been switched to gio already.

Reviewed at https://reviews.imfreedom.org/r/293/
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