cleanup protocol_zt

- get rid of current_ms
- implement and call zerotier_network_stop in the destructor

Source/dvlnet/protocol_zt.cpp

@@ -289,6 +289,8 @@ void protocol_zt::close_all()
 protocol_zt::~protocol_zt()
 {
 	close_all();
+
+	zerotier_network_stop();
 }
 
 void protocol_zt::endpoint::from_string(const std::string& str)
@@ -311,11 +313,6 @@ void protocol_zt::endpoint::to_addr(unsigned char* dest_addr) const
 	memcpy(dest_addr, addr.data(), sizeof(addr)); 
 }
 
-uint64_t protocol_zt::current_ms()
-{
-	return 0;
-}
-
 void protocol_zt::make_default_gamename(char (&gamename)[NET_MAX_GAMENAME_LEN + 1])
 {
 	int i;

Source/dvlnet/protocol_zt.h

@@ -73,7 +73,6 @@ class protocol_zt {
 	int fd_tcp = -1;
 	int fd_udp = -1;
 
-	static uint64_t current_ms();
 	void close_all();
 
 	static void set_nonblock(int fd);

Source/dvlnet/zerotier_native.cpp

@@ -64,6 +64,11 @@ void zerotier_network_start()
 	zts_node_start();
 }
 
+void zerotier_network_stop()
+{
+	zts_node_stop();
+}
+
 } // namespace net
 DEVILUTION_END_NAMESPACE
 #endif // ZEROTIER