rakudo.eclass requires install-dist.raku installed by a modified version
of dev-lang/rakudo. Gentoo overlay's dev-lang/rakudo doesn't install
install-dist.raku.
rakudo.eclass is minimal and elegant. dev-raku/* packages depend on
rakudo.eclass.
Signed-off-by: amano.kenji <amano.kenji@proton.me>
