o3tl: refcounts should be native platform int width

Change-Id: I19854d85b680612733557c42ee58b35adb5ea4c3
Reviewed-on: https://gerrit.libreoffice.org/29002Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

include/o3tl/cow_wrapper.hxx

@@ -34,7 +34,7 @@ namespace o3tl
      */
     struct UnsafeRefCountingPolicy
     {
-        typedef sal_uInt32 ref_count_t;
+        typedef sal_Size ref_count_t;
         static void incrementCount( ref_count_t& rCount ) { ++rCount; }
         static bool decrementCount( ref_count_t& rCount ) { return --rCount != 0; }
     };