Problem: redundant empty dtor

Solution: removed

src/clock.cpp

@@ -136,10 +136,6 @@ zmq::clock_t::clock_t () :
 {
 }
 
-zmq::clock_t::~clock_t ()
-{
-}
-
 uint64_t zmq::clock_t::now_us ()
 {
 #if defined ZMQ_HAVE_WINDOWS

src/clock.hpp

@@ -54,7 +54,6 @@ class clock_t
 {
   public:
     clock_t ();
-    ~clock_t ();
 
     //  CPU's timestamp counter. Returns 0 if it's not available.
     static uint64_t rdtsc ();