Fixes#13944
Moved "opt_printf_stderr" out of apps.c to avoid duplicate definition in tests.
Added function "asn1_string_to_time_t" including tests.
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17645)
