wp-settings does not check if ABSPATH is defined

[tivnet]

I believe, something like this should appear at the beginning of wp-settings.php:

if ( !defined('ABSPATH') ) {
 die;
}

• Obviously, those lines won't work without the above validation:

require( ABSPATH . WPINC . '/load.php' );
...

• With php display errors turned on, calling this file directly may reveal some sensitive information.

Duplicate of #10367.