Use more efficient storage for wxIntSortedArray

As this array contains ints, store them in wxVector<int> instead of
taking twice as much memory (in 64 bit builds) by storing them in
wxVector<void*>.

src/generic/gridsel.cpp

@@ -40,7 +40,7 @@ int CompareInts(int n1, int n2)
 
 }
 
-WX_DEFINE_SORTED_ARRAY(int, wxIntSortedArray);
+WX_DEFINE_SORTED_ARRAY_INT(int, wxIntSortedArray);
 
 
 wxGridSelection::wxGridSelection( wxGrid * grid,