fixed bogus undefined symbols with hpux compiler

src/ca/putCallback.cpp

@@ -71,6 +71,13 @@ void putCallback::exception (
     this->chan.getClientCtx().destroyPutCallback ( *this );
 }
 
+void * putCallback::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 putCallback::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if