Jan-Michael Brummer authored Jun 27, 2023 and Tim Rühsen committed Oct 20, 2023

Add support for libproxy, which is capable to extract desktop
environment proxy configurations from dozens of systems and platforms.
This also enables wget to handle pac/wpad proxy server.

* configure.ac: Add check for libbproxy.
* src/retr.c (getproxy): Retrieve proxy via libproxy.

Copyright-paperwork-exempt: Yes