Crashlog: Update thread/lock handling to match GameLoop changes

src/os/windows/win32.cpp

@@ -734,12 +734,18 @@ int OTTDStringCompare(const char *s1, const char *s2)
 }
 
 static DWORD main_thread_id;
+static DWORD game_thread_id;
 
 void SetSelfAsMainThread()
 {
 	main_thread_id = GetCurrentThreadId();
 }
 
+void SetSelfAsGameThread()
+{
+	game_thread_id = GetCurrentThreadId();
+}
+
 static BOOL (WINAPI *_SetThreadStackGuarantee)(PULONG) = nullptr;
 
 void PerThreadSetup()
@@ -765,6 +771,11 @@ bool IsNonMainThread()
 	return main_thread_id != GetCurrentThreadId();
 }
 
+bool IsGameThread()
+{
+	return game_thread_id == GetCurrentThreadId();
+}
+
 static std::map<DWORD, std::string> _thread_name_map;
 static std::mutex _thread_name_map_mutex;