tests/test-gendoc-sv.t

hidden: drop the hidden cache logic

The improvement in time complexitty and the speed-up in computation is large
enough that the has little use now. Its update time can even gets in the way. So
we drop it.

This will allow us to unify the static/dynamic blockers logic in the next
changeset.

#require docutils gettext

  $ $TESTDIR/check-gendoc sv
  checking for parse errors