Patch Does not work

<?php
/*
Plugin Name: Remove Trash link
Description: Remove Trash link and Spam link from comment notification email
Version: 1.0
Author: Wordpress

 **/
if ( !function_exists('wp_notify_postauthor') ) :
function wp_notify_postauthor($comment_id, $comment_type='') {
    $comment = get_comment($comment_id);
    $post    = get_post($comment->comment_post_ID);
    $user    = get_userdata( $post->post_author );

    if ( $comment->user_id == $post->post_author ) return false; // The author moderated a comment on his own post

    if ('' == $user->user_email) return false; // If there's no email to send the comment to

    $comment_author_domain = @gethostbyaddr($comment->comment_author_IP);

    // The blogname option is escaped with esc_html on the way into the database in sanitize_option
    // we want to reverse this for the plain text arena of emails.
    $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);

    if ( empty( $comment_type ) ) $comment_type = 'comment';

    if ('comment' == $comment_type) {
        $notify_message  = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n";
        /* translators: 1: comment author, 2: author IP, 3: author domain */
        $notify_message .= sprintf( __('Author : %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
        $notify_message .= sprintf( __('E-mail : %s'), $comment->comment_author_email ) . "\r\n";
        $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
        $notify_message .= sprintf( __('Whois  : http://ws.arin.net/cgi-bin/whois.pl?queryinput=%s'), $comment->comment_author_IP ) . "\r\n";
        $notify_message .= __('Comment: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
        $notify_message .= __('You can see all comments on this post here: ') . "\r\n";
        /* translators: 1: blog name, 2: post title */
        $subject = sprintf( __('[%1$s] Comment: "%2$s"'), $blogname, $post->post_title );
    } elseif ('trackback' == $comment_type) {
        $notify_message  = sprintf( __( 'New trackback on your post "%s"' ), $post->post_title ) . "\r\n";
        /* translators: 1: website name, 2: author IP, 3: author domain */
        $notify_message .= sprintf( __('Website: %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
        $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
        $notify_message .= __('Excerpt: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
        $notify_message .= __('You can see all trackbacks on this post here: ') . "\r\n";
        /* translators: 1: blog name, 2: post title */
        $subject = sprintf( __('[%1$s] Trackback: "%2$s"'), $blogname, $post->post_title );
    } elseif ('pingback' == $comment_type) {
        $notify_message  = sprintf( __( 'New pingback on your post "%s"' ), $post->post_title ) . "\r\n";
        /* translators: 1: comment author, 2: author IP, 3: author domain */
        $notify_message .= sprintf( __('Website: %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
        $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
        $notify_message .= __('Excerpt: ') . "\r\n" . sprintf('[...] %s [...]', $comment->comment_content ) . "\r\n\r\n";
        $notify_message .= __('You can see all pingbacks on this post here: ') . "\r\n";
        /* translators: 1: blog name, 2: post title */
        $subject = sprintf( __('[%1$s] Pingback: "%2$s"'), $blogname, $post->post_title );
    }
    $notify_message .= get_permalink($comment->comment_post_ID) . "#comments\r\n\r\n";

        // check that author can edit comments, in case their role has changed
        if ( user_can( $author->ID, 'edit_comment', $comment_id ) ) {
                if ( EMPTY_TRASH_DAYS )
                $notify_message .= sprintf( __('Trash it: %s'), admin_url("comment.php?action=trash&c=$comment_id") ) . "\r\n";
                else
                $notify_message .= sprintf( __('Delete it: %s'), admin_url("comment.php?action=delete&c=$comment_id") ) . "\r\n";
                $notify_message .= sprintf( __('Spam it: %s'), admin_url("comment.php?action=spam&c=$comment_id") ) . "\r\n";
        }

    $wp_email = 'wordpress@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME']));

    if ( '' == $comment->comment_author ) {
        $from = "From: \"$blogname\" <$wp_email>";
        if ( '' != $comment->comment_author_email )
            $reply_to = "Reply-To: $comment->comment_author_email";
    } else {
        $from = "From: \"$comment->comment_author\" <$wp_email>";
        if ( '' != $comment->comment_author_email )
            $reply_to = "Reply-To: \"$comment->comment_author_email\" <$comment->comment_author_email>";
    }

    $message_headers = "$from\n"
        . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";

    if ( isset($reply_to) )
        $message_headers .= $reply_to . "\n";

    $notify_message = apply_filters('comment_notification_text', $notify_message, $comment_id);
    $subject = apply_filters('comment_notification_subject', $subject, $comment_id);
    $message_headers = apply_filters('comment_notification_headers', $message_headers, $comment_id);

    @wp_mail($user->user_email, $subject, $notify_message, $message_headers);

    return true;
}
endif;
?>