Remove support for OpenSSL 1.0.1

Michael Paquier <michael@paquier.xyz>

Commit: 8e278b65766446f29085fe686723961c4b216e6f
Author: Michael Paquier <michael@paquier.xyz>
Date: 2023-07-03T04:20:27Z
Releases: 17.0
Remove support for OpenSSL 1.0.1

Here are some notes about this change:
- As X509_get_signature_nid() should always exist (OpenSSL and
LibreSSL), hence HAVE_X509_GET_SIGNATURE_NID is now gone.
- OPENSSL_API_COMPAT is bumped to 0x10002000L.
- One comment related to 1.0.1e introduced by 74242c2 is removed.

Upstream OpenSSL still provides long-term support for 1.0.2 in a closed
fashion, so removing it is out of scope for a few years, at least.

Reviewed-by: Jacob Champion, Daniel Gustafsson
Discussion: https://postgr.es/m/ZG3JNursG69dz1lr@paquier.xyz

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