tdf#89329: use unique_ptr for pImpl in svdoole2

Change-Id: Ie189576336e0670102d7675b59f30e3fc357671d
Reviewed-on: https://gerrit.libreoffice.org/25942Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

include/svx/svdoole2.hxx

@@ -44,7 +44,7 @@ class SdrOle2ObjImpl;
 class SVX_DLLPUBLIC SdrOle2Obj : public SdrRectObj
 {
 private:
-    SdrOle2ObjImpl* mpImpl;
+    std::unique_ptr<SdrOle2ObjImpl> mpImpl;
 
 private:
     SVX_DLLPRIVATE void Connect_Impl();