HPUX: Delete void * operator new(size_t) methods

These were apparently needed by the HPUX compiler even though it
never actually executed them.  They are never used.

src/ca/client/netSubscription.cpp

@@ -170,13 +170,6 @@ void netSubscription::forceSubscriptionUpdate (
         guard, chan, *this );
 }
 
-void * netSubscription::operator new ( size_t )
-{
-    // The HPUX compiler seems to require this even though no code
-    // calls it directly
-    throw std::logic_error ( "why is the compiler calling private operator new" );
-}
-
 void netSubscription::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if