support non-standard crawl ports

had been earmarked for Advanced Crawling Add-on, but based on following workaroud by @john-shaffer, it may be possible to avoid add-on by adding some logic like John's

ie, reproduce issue and investigate better handling of Site URL/Home's port when they've been set via wp-config.php

```php
// wp-config.php
if ( defined( 'WP_CLI' ) ) {
$_SERVER['HTTP_HOST'] = 'localhost:1234';
}

define('WP_SITEURL', 'http://' . $_SERVER['HTTP_HOST'] . '/');
define('WP_HOME', 'http://' . $_SERVER['HTTP_HOST'] . '/');
```