dev-lang/swi-prolog: add 9.1.8

[CyberTailor]

Also enable optional tcmalloc support.

[gentoo-bot]

Pull Request assignment

Submitter: @CyberTailor
Areas affected: ebuilds
Packages affected: dev-lang/swi-prolog

dev-lang/swi-prolog: @gentoo/prolog

Linked bugs

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2023-04-09 09:18 UTC
Newest commit scanned: fc42b88
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/81ecb48807/output.html