See tracker bug.
only needed by yacpi, and there are many other tools to look for acpi information
commit f3beca2260265fe3ad95344c9f64d3595325c2eb Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Mon Aug 14 23:11:51 2017 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Mon Aug 14 23:24:19 2017 sys-libs/libacpi: Remove last-rited pkg, #587284