Dont use fm stuff

src/network/lan.cpp

@@ -30,9 +30,10 @@ along with Freeminer.  If not, see <http://www.gnu.org/licenses/>.
 #include "server/serverlist.h"
 #include "debug.h"
 #include "json/json.h"
+#include <mutex>
+#include <shared_mutex>
 #include "porting.h"
 #include "threading/thread.h"
-#include "threading/concurrent_map.h"
 #include "network/address.h"
 
 //copypaste from ../socket.cpp
@@ -303,6 +304,7 @@ void *lan_adv::run()
 			if (p["port"].isInt()) {
 				p["address"] = addr_str;
 				auto key = addr_str + ":" + p["port"].asString();
+				std::unique_lock lock(mutex);
 				if (p["cmd"].asString() == "shutdown") {
 					//infostream << "server shutdown " << key << "\n";
 					collected.erase(key);

src/network/lan.h

@@ -20,10 +20,11 @@ along with Freeminer.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 
 #include "json/json.h"
+#include <map>
+#include <shared_mutex>
 #include <string>
 #include <atomic>
 #include "threading/thread.h"
-#include "threading/concurrent_map.h"
 
 
 class lan_adv : public Thread
@@ -37,7 +38,9 @@ class lan_adv : public Thread
 
 	void serve(unsigned short port);
 
-	concurrent_map<std::string, Json::Value> collected;
+	std::map<std::string, Json::Value> collected;
+	std::shared_mutex mutex;
+
 	std::atomic_bool fresh;
 	std::atomic_int clients_num;
 

src/script/lua_api/l_mainmenu.cpp

@@ -1101,6 +1101,7 @@ int ModApiMainMenu::l_get_lan_servers(lua_State *L)
 	int top = lua_gettop(L);
 	unsigned int index = 1;
 
+	std::shared_lock lock(ServerList::lan_adv_client.mutex);
 	for (const auto &server : ServerList::lan_adv_client.collected) {
 		lua_pushnumber(L, index);