crypto/openssl: make manpage generation repeatable

[ngie]

Summary

This change makes manpage generation repeatable by parsing the release
date out of configdata.pn and passing the appropriate value to pod2man's
--date argument.

This patch has been submitted upstream [1].

1. https://github.com/openssl/openssl/issues/28323 .

[ngie]

crypto/openssl/Configurations/unix-Makefile.tmpl

1571

This needs to be a double backslash.

[ngie]

Incorporated into the upstream project and handled as part of the 3.5.3 version update.