eclass: Remove unused eclasses

These are eclasses that have been removed from upstream ::gentoo and
also have no consumers in ChromeOS.

BUG=none
TEST=CQ passes

Change-Id: I8076e7c8c3901b344d26c212551f0123a72df31d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/4958759
Tested-by: Matt Turner <msturner@google.com>
Auto-Submit: Matt Turner <msturner@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
13 files changed