x11-wm/awesome: revert amd64 stabilisation

x11-wm/awesome: revert amd64 stabilisation

Awesome 4 is NOT a drop-in replacement for Awesome 3.5 because introduces
many breaking changes to the v3.5 API. Even an unmodified upstream rc.lua
from 3.5.9 will fail to load in 4.2, and everyone using customised
configuration and/or third-party libraries has got a lot of porting work
cut out for them. Therefore, at the very least stabilising >=x11-wm/awesome-4.0
should be preceded by a news item.

See-also: https://awesomewm.org/apidoc/documentation/89-NEWS.md.html#v4
See-also: https://awesomewm.org/apidoc/documentation/17-porting-tips.md.html#v4
Package-Manager: Portage-2.3.24, Repoman-2.3.6