build_packages: Restrict revdep calculation to known bad packages

Rather than calculating reverse dependencies on all packages, rely on
the subslot logic in cros-workon.eclass to trigger rebuilds for most
packages. Restrict the reverse dependency calculation only to certain
packages that we know don't (or can't) declare their dependencies and
subslots correctly.

BUG=chromium:1071530
TEST=`build_packages`

Change-Id: Iaa75a4979a626f62880a6e7a35819af3dff2efcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2248407
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
1 file changed