move PVValueArray dtor out of line

This class has out of line members, and explicit
instanciations.  Move the dtor out of line as
well to maybe avoid emitting duplicate
typeinfo.

src/factory/PVDataCreateFactory.cpp

@@ -156,6 +156,9 @@ PVValueArray<PVUnionPtr>::PVValueArray(UnionArrayConstPtr const & unionArray)
     ,unionArray(unionArray)
 {}
 
+template<typename T>
+PVValueArray<T>::~PVValueArray() {}
+
 template<typename T>
 void PVValueArray<T>::setCapacity(size_t capacity)
 {

src/pv/pvData.h

@@ -1157,7 +1157,7 @@ public:
     /**
      * Destructor
      */
-    virtual ~PVValueArray() {}
+    virtual ~PVValueArray();
 
     /**
      * Get introspection interface.