tcp-bsd: Restore global locks
Avoids race between socket_send_more() and socket_close() leading either to crash on use of freed NiceSocket, or abort upon attempting to g_mutex_clear() a locked mutex.
Akin to what d1611c0c did to udp-turn.
Avoids race between socket_send_more() and socket_close() leading either to crash on use of freed NiceSocket, or abort upon attempting to g_mutex_clear() a locked mutex.
Akin to what d1611c0c did to udp-turn.