Work around SWIG problems

pcbnew/board.h

@@ -324,6 +324,13 @@ public:
 
     const MARKERS& Markers() const { return m_markers; }
 
+    // SWIG requires non-const accessors for some reason to make the custom iterators in board.i
+    // work.  It would be good to remove this if we can figure out how to fix that.
+#ifdef SWIG
+    DRAWINGS& Drawings() { return m_drawings; }
+    TRACKS& Tracks() { return m_tracks; }
+#endif
+
     const BOARD_ITEM_SET GetItemSet();
 
     /**