give copy ctor a conventional signature

sd/source/filter/eppt/pptx-text.cxx

@@ -1285,9 +1285,9 @@ TextObj::TextObj( ::com::sun::star::uno::Reference< ::com::sun::star::text::XSim
     ImplCalculateTextPositions();
 }
 
-TextObj::TextObj( TextObj& rTextObj )
+TextObj::TextObj( const TextObj& rTextObj )
 {
-    mpImplTextObj = rTextObj.mpImplTextObj;
+    mpImplTextObj = const_cast<TextObj&>(rTextObj).mpImplTextObj;
     mpImplTextObj->mnRefCount++;
 }
 

sd/source/filter/eppt/text.hxx

@@ -249,7 +249,7 @@ class TextObj
     public :
                         TextObj( ::com::sun::star::uno::Reference< ::com::sun::star::text::XSimpleText > &
                                     rXText, int nInstance, FontCollection& rFontCollection, PPTExBulletProvider& rBuProv );
-                        TextObj( TextObj& rTextObj );
+                        TextObj( const TextObj& rTextObj );
                         ~TextObj();
 
         void            Write( SvStream* pStrm );