ssl: modify libssl so that it uses OSSL_TIME

ssl: modify libssl so that it uses OSSL_TIME

This is instead of time_t and struct timeval.  Some public APIs mandate a
presence of these two types, but they are converted to OSSL_TIME internally.

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19082)