net/liveMedia: update to 2020.11.21

2020.11.21:

• Removed the use of "our_inet_addr()" (and "inet_addr()") functions, and replaced them with calls to (the more up-to-date) "inet_pton()" function.
• Updated the "parseRTSPURL()" function to recognize IP address literals (in "rtsp://" URLs) that are enclosed in square brackets []. (This is how IPv6 address literals are included in URs, although we don't yet support IPv6.)