During BUILD_WITH_STRICT_TMPPATH builds we need to symlink the host's
kbdcontrol into WORLDTMP/legacy/bin so that it can be used. For
completeness, also check if the host has it, since technically the host
could have been built with WITHOUT_LEGACY_CONSOLE (though given nobody's
screamed since this code was removed that's likely not something that
gets hit in practice), and handle BOOTSTRAP_ALL_TOOLS (especially since
that case will cover cross-building if and when kbdcontrol can be built
on non-FreeBSD).
This allows a BUILD_WITH_STRICT_TMPPATH tinderbox to pass.
This partially reverts commit 33550b47391330362ea58984aa3fd691f6219ee0.