crypto: use X509_STORE_CTX_new

In OpenSSL 1.1.0, X509_STORE_CTX is opaque and thus cannot be
stack-allocated. This works in OpenSSL 1.1.0 and 1.0.2. Adapted from PR

PR-URL: https://github.com/nodejs/node/pull/16130


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <rod@vagg.org>