Allow openssl version to function in the absence of a config file

Allow openssl version to function in the absence of a config file

the openssl application attempts to load a config file on startup
always, calling x509_get_default_cert_area() to locate the file.  On
Windows builds with -DOSSL_WINCTX set, this fails if the corresponding
registry keys are unset. allow openssl to continue to function properly
for applets that don't actually require a configuration file.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24450)