Disallow the edit links to appear in simplenews, rss, preview and print

Found a solution.
Below a patch that disallow the edit links to appear on other output as screen (print, rss, preview, so called build modes). Edit links only makes sense in screen mode (constant NODE_BUILD_NORMAL).

line 241:

 // Content type settings.
      $node = $vars['node'];
+      if (isset($node->build_mode) && !($node->build_mode===NODE_BUILD_NORMAL)) 
+     //NODE_BUILD_NORMAL is 0, and ('whatever' == 0) is TRUE, so we need a ===.
+       return FALSE;
      $allowed_nodes = variable_get('block_edit_content_types', 

I have not figured out yet how to contribute a patch, so hopefully, someone can add this.