Revert "Add OPENSSL_VERSION_AT_LEAST"

Fixes #5961

This reverts commit 3c5a61dd

.

The macros OPENSSL_MAKE_VERSION() and OPENSSL_VERSION_AT_LEAST() contain
errors and don't work as designed. Apart from that, their introduction
should be held back until a decision has been mad about the future
versioning scheme.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5968)