Fix list of SSL error codes for older OpenSSL versions.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e1cc25f59a8a90d821aaf894e1691575ed94454e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-06-27T17:26:17Z
Releases: 14.0
Fix list of SSL error codes for older OpenSSL versions.

Apparently 1.0.1 lacks SSL_R_VERSION_TOO_HIGH and
SSL_R_VERSION_TOO_LOW.  Per buildfarm.

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