Crashlog: Update thread/lock handling to match GameLoop changes

src/os/unix/unix.cpp

@@ -341,6 +341,7 @@ int GetCurrentThreadName(char *str, const char *last)
 }
 
 static pthread_t main_thread;
+static pthread_t game_thread;
 
 void SetSelfAsMainThread()
 {
@@ -349,6 +350,13 @@ void SetSelfAsMainThread()
 #endif
 }
 
+void SetSelfAsGameThread()
+{
+#if !defined(NO_THREADS)
+	game_thread = pthread_self();
+#endif
+}
+
 void PerThreadSetup() { }
 
 void PerThreadSetupInit() { }
@@ -370,3 +378,12 @@ bool IsNonMainThread()
 	return false;
 #endif
 }
+
+bool IsGameThread()
+{
+#if !defined(NO_THREADS)
+	return game_thread == pthread_self();
+#else
+	return false;
+#endif
+}