Remove copy ctor of atomic counter on OS X

This is not present on any of the other platforms so it is not needed,
but it uses a removed method (to receive the value) so it won't compile.

Fwk/VizFwk/LibCore/cvfAtomicCounter.cpp

@@ -99,12 +99,6 @@ AtomicCounter::AtomicCounter(int initialValue)
 }
 
 
-AtomicCounter::AtomicCounter(const AtomicCounter& counter)
-    : m_counter(counter.value())
-{
-}
-
-
 AtomicCounter::~AtomicCounter()
 {
 }