multimedia/vlc: Make UPNP a default OPTION

Rationale: UPNP / DLNA is a widespread way of serving media via various
off-the-shelf NAS devices, and also with our own port of minidlna. It's
well suited to be included in the official VLC package.

PR:		260617
Reported by:	hellocodebsd@gmail.com
MFH:		2022Q2