Windows builds with insecure path defaults (CVE-2019-1552)

Advisory: https://www.openssl.org/news/secadv/20190730.txt

Severity: Low

OpenSSL has internal defaults for a directory tree where it can find a
configuration file as well as certificates used for verification in
TLS.  This directory is most commonly referred to as OPENSSLDIR, and
is configurable with the --prefix / --openssldir configuration options.

For …