QJsonPrivate::q_littleendian: mark as primitive/movable, depending on T

Inherit the type-classification from the underlying type.

This amends commit 4889269ff0,
which introduced a QVector<QJsonPrivate::offset>, but failed
to mark the payload as primitive.

Change-Id: I525a0456a550e0694b33b36b4aa71475aeac192b
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

src/corelib/json/qjson_p.h

@@ -144,6 +144,13 @@ public:
         return *this;
     }
 };
+} // namespace QJsonPrivate
+
+template <typename T>
+class QTypeInfo<QJsonPrivate::q_littleendian<T> >
+    : public QTypeInfoMerger<QJsonPrivate::q_littleendian<T>, T> {};
+
+namespace QJsonPrivate {
 
 typedef q_littleendian<short> qle_short;
 typedef q_littleendian<unsigned short> qle_ushort;