Re: pgsql: Provide a TLS init hook

I wrote:
> Concretely, I see that contrib/sslinfo has
> SHLIB_LINK += $(filter -lssl -lcrypto -lssleay32 -leay32, $(LIBS))

I verified that that fixes things on macOS and pushed it, along with
a couple other minor fixes.

However, I'm quite desperately unhappy that the new test module
does this:

$node->append_conf('postgresql.conf', "listen_addresses = 'localhost'");

That's opening a security hole. Note that we do *not* run src/test/ssl
by default, and it has a README warning people not to run it on multiuser
systems. It seems 100% unacceptable for this test to fire up a similarly
insecure server without so much as a by-your-leave.

I don't actually see why we need the localhost port at all --- it doesn't
look like this test ever attempts to connect to the server. So couldn't
we just drop that?

regards, tom lane