build: fix compiling against openssl with no-psk

Node 15 prior to this commit will not compile if openssl is built with
no-psk. Compiling emits an error like this:

```
crypto_tls.cc:(.text+0x4c27): undefined reference to
`node::crypto::TLSWrap::SetCACerts(node::crypto::SecureContext*)'
```

Blame on crypto_tls.cc shows the file was created in a refactor. Before
that refactor SetCACerts was defined outside OPENSSL_NO_PSK ifndef.

PR-URL: https://github.com/nodejs/node/pull/36881
Fixes: https://github.com/nodejs/node/issues/36464


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>