Drupal: map content_taxonomy field vocabulary settings to core taxonomy node type configuration

gistfile1.php

$nodes = array();
foreach (content_fields() as $field_key => $field) {
  if (strpos($field['module'], 'content_taxonomy') === 0) {
    $type = $field['type_name'];
    $nodes[$field['vid']][$field_key] = $type;
  }
}
module_load_include('inc', 'taxonomy', 'taxonomy.admin');
foreach ($nodes as $vid => $types) {
  $vocabulary = (array) taxonomy_vocabulary_load($vid);
  foreach ($types as $type) {
    $vocabulary['nodes'][$type] = $type;
  }

  taxonomy_save_vocabulary($vocabulary);
}