Remove no-non-virtual-dtor flag

BZ: 111473

The warning non-virtual-dtor should not be ignored for the whole project, but
only in the few cases where it it necessary.

Change-Id: I0ede82a30f2cd055b789f7fb56104fb227934e6f
Signed-off-by: Sebastien Gonzalve <sebastien.gonzalve@intel.com>
Signed-off-by: Guilhem IMBERTON <guilhem.imberton@intel.com>
Reviewed-on: http://android.intel.com:8080/110191
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
diff --git a/parameter/BackSynchronizer.h b/parameter/BackSynchronizer.h
index 2c3cdac..793c687 100644
--- a/parameter/BackSynchronizer.h
+++ b/parameter/BackSynchronizer.h
@@ -38,10 +38,12 @@
 
     // Back synchronization
     virtual void sync() = 0;
+    virtual ~CBackSynchronizer() {}
 
 protected:
     // Aggegate list
     list<const CConfigurableElement*> _needingBackSyncList;
+
 private:
     // Aggegator
     CConfigurableElementAggregator _configurableElementAggregator;