Avoid chicken and egg problem with reg setting

Avoid chicken and egg problem with reg setting

Because openssl with -DOSSL_WINCTX no longer falls back to build time
defines, we have a chicken and egg problem.  CI needs to query openssl
for its version string so registry keys can be set properly, but openssl
version refuses to run because no configuration file can be found

So we work around it by, for the purposes of setting the registry keys,
we set OPENSSL_CONF to a know config file, so that openssl version runs
properly.

Once the version is extracted, we can set the registry keys, and openssl
will function properly without OPENSSL_CONF set

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