x11-terms/terminology: fix up live ebuild

x11-terms/terminology: fix up live ebuild

Upstream migrated to meson as build system, autotools support has been
removed.
The meson eclass requires EAPI 6, which the enlightenment eclass does
not support.
I feel the enlightenment.eclass has outlived its usefulness, so this
patch drops it completely and replaces it by including an additional 3
lines of boilerplate, which is all that using the eclass saved.

Package-Manager: Portage-2.3.13, Repoman-2.3.4
Closes: https://github.com/gentoo/gentoo/pull/6193
Closes: https://bugs.gentoo.org/637544