CoreMIDI driver fix: A MIDIPacket can contain more than 1 event.
Add JackNetMaster::LatencyCallback.
Rework latency settings in netjack.
Correct typo in JackCoreAudioDriver::OpenAUHAL.
Add USE_CLASSIC_AUTOLAUNCH in XCode project.
Correct auto-connect for audioadapter.
Correct long standing bug in SyncRecv.
wscript: Fix build error when sys.platform == linux3

Some python implementations report "linux3" on newer kernels. Of course,
we'll have to set IS_LINUX for those, too.