The source project of this merge request has been removed.
testing/swi-prolog: upgrade to 8.5.9
Using pcre2, as per: https://swi-prolog.discourse.group/t/ann-swi-prolog-8-5-9/5169
Using pcre2, as per: https://swi-prolog.discourse.group/t/ann-swi-prolog-8-5-9/5169