upnp/ftp support for libvlc on apple platforms

Opening this issue to take care (and keep track) of VLCKit#262 (closed)

[0:] looking for services_discovery module matching "upnp": 5 candidates
[0:] Initializing libupnp on 'default' interface
[0:] Initialization failed: UPNP_E_SOCKET_ERROR
[0:] no services_discovery modules matched
[0:] no suitable services discovery module

Edited May 16, 2019 by Martin Finkel

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