ZVBI: add current definitions for Serbia, Croatia and  Romania

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
auhal: fix memleak
macosx: fix memleak in position formatter
macosx: fix memleak in audio device list update
auhal: better deregistration of deviceAlive and audioStreams callbacks
auhal: synchronize access to devices_list
auhal: another memleak fix