Fix compilation with older OpenSSL versions

Fix compilation with older OpenSSL versions

Some older OpenSSL versions (0.9.8 branch) define TLS*_VERSION macros
but not the corresponding SSL_OP_NO_* macro, which causes the code for
handling ssl_min_protocol_version/ssl_max_protocol_version to fail to
compile.  To fix, add more #ifdefs and error handling.

Reported-by: Victor Wagner <[email protected]>
Reviewed-by: Michael Paquier <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/20190924101859.09383b4f%40fafnir.local.vm