netherlands swi-prolog.org site failing breaks pack_install

[Anniepoo]

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The swi-prolog.org site is down this morning.

we can tell humans to go to us.swi-prolog.org and it's only 'we're an OS project, if you don't like it help get CDN running', but this morning all our setup scripts are broken because they call pack_install, which tries the main site.

Good reason to increase priority of getting CDN running