QHostInfo::lookupHost: enable QT_NO_CONTEXTLESS_CONNECT

QHostInfo::lookupHost uses some QObject private APIs in order to have a
invoke a slot/function when the lookup is finished. The overload that
simply takes a function (and not a context object) was still available
even under QT_NO_CONTEXTLESS_CONNECT, because indeed the implementation
bypasses the public QObject::connect API. Hence, explicitly the overload
that doesn't take a context object.

Change-Id: Ibf5b0efc49b7f9c8d045862ae061f4e05ee1b769
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/network/kernel/qhostinfo.h

@@ -73,12 +73,14 @@ public:
     }
 #endif // Q_QDOC
 
+#ifndef QT_NO_CONTEXTLESS_CONNECT
     // lookupHost to a callable (without context)
     template <typename Functor>
     static inline int lookupHost(const QString &name, Functor &&slot)
     {
         return lookupHost(name, nullptr, std::forward<Functor>(slot));
     }
+#endif // QT_NO_CONTEXTLESS_CONNECT
 
 private:
     QHostInfoPrivate *d_ptr;