sys-devel/build-tools: awk is required for Portage to apply patches.
virtual/adelie-base: add a conformant tar(1) implementation, libarchive.

packages: specify all packages required to conform to old 1003.2
package.use: add tty-helpers to util-linux for mesg(1) and write(1)
package.accept_keywords: unkeyword packages where required

Also ensure PAM defaults are sane.