Fix Android remote debug not hitting breakpoints

A change in `Main`'s API is needed. Please read the comment in the diff for an explanation.

main/main.h

@@ -34,6 +34,7 @@
 	@author Juan Linietsky <reduzio@gmail.com>
 */
 
+#include "core/os/thread.h"
 #include "error_list.h"
 #include "typedefs.h"
 
@@ -49,7 +50,7 @@ class Main {
 
 public:
 	static Error setup(const char *execpath, int argc, char *argv[], bool p_second_phase = true);
-	static Error setup2();
+	static Error setup2(Thread::ID p_main_tid_override = 0);
 	static bool start();
 	static bool iteration();
 	static void cleanup();