PHP: Override WPtouch's content_url function to make use of `content_url` instead of `WP_CONTENT_URL`.

override-wptouch-urls.php

<?php
/*
Plugin Name: Override WPtouch URLs
Plugin URI: http://dessibelle.se
Description: Overrides WPtouch's content_url function to make use of `content_url` instead of `WP_CONTENT_URL`.
Author: Simon Fransson
Version: 1.0
Author URI: http://dessibelle.se/
*/


if ( !function_exists( 'compat_get_wp_content_url' ) ) {
	function compat_get_wp_content_url() {
	    if (function_exists('content_url')) {
	        return content_url();
	    } elseif ( defined( 'WP_CONTENT_URL') ) {
			return WP_CONTENT_URL;
		} else {
			return ABSPATH . 'wp-content';
		}
	}
}

Make sure this code loads before WPtouch, and Any Hostname will be able to filter the URLs returned by WPtouch.