Make sure $wp_cache_no_cache_for_get, $wp_cache_object_cache, $wp_cache_request_uri are visible to the OB callback to avoid warnings and fix functionality


git-svn-id: https://plugins.svn.wordpress.org/wp-super-cache/trunk@962356 b8457f37-d9ea-0310-8a92-e5e31aec5664
Replace wpdb->escape with esc_sql() as it's deprecated.


git-svn-id: https://plugins.svn.wordpress.org/wp-super-cache/trunk@962358 b8457f37-d9ea-0310-8a92-e5e31aec5664