net/liveMedia: update to 2020.01.24

2020.01.24:

• Added #ifdefs around the code in the function "setSocketKeepAlive()" (in "GroupsockHelper.cpp") in case "TCP_KEEPCNT" and/or "TCP_KEEPINTVL" are not defined. (Thanks to Wictor Lund for reporting this issue.)
• More minor improvements to the "mikeyParse" testProg