Remove support for temporal RESTRICT foreign keys
It isn't clear how these should behave, so let's wait to implement them
until we are sure how to do it.
This feature was initially added by commit
89f908a6d0a, so it hasn't
been released yet.
Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Discussion: https://postgr.es/m/
e773bc11-4ac1-40de-bb91-
814e02f05b6d%40eisentraut.org