add deadlock solution

exercises/deadlock/simple_deadlock.c

@@ -14,11 +14,11 @@ void shared_print_thread_even(int i) {
 }
 
 void shared_print_thread_odd(int i) {
-  pthread_mutex_lock(&odd_mutex);
   pthread_mutex_lock(&even_mutex);
+  pthread_mutex_lock(&odd_mutex);
   printf(" %d ", i);
-  pthread_mutex_unlock(&even_mutex);
   pthread_mutex_unlock(&odd_mutex);
+  pthread_mutex_unlock(&even_mutex);
 }
 
 void shared_print_main(int i) {