remove NullCondition unused code

include/llarp/threading.hpp

@@ -29,48 +29,9 @@ namespace llarp
       }
     };
 
-    /// a condition variable that does nothing
-    struct NullCondition
-    {
-      template < typename Lock_t >
-      void
-      wait(Lock_t& l)
-      {
-      }
-
-      template < typename Lock_t, typename Pred >
-      void
-      wait(Lock_t& l, Pred p)
-      {
-      }
-
-      void
-      notify_one()
-      {
-      }
-
-      void
-      notify_all()
-      {
-      }
-
-      template < typename Interval >
-      void
-      wait_for(NullLock& l, Interval i)
-      {
-        std::this_thread::sleep_for(i);
-      }
-    };
-
-#ifdef SHADOW_TESTNET
-    typedef NullMutex mtx_t;
-    typedef NullLock lock_t;
-    typedef NullCondition cond_t;
-#else
     typedef std::mutex mtx_t;
     typedef std::unique_lock< std::mutex > lock_t;
     typedef std::condition_variable cond_t;
-#endif
 
     struct Mutex
     {