[openssl:x64-windows] Provider legacy cannot be loaded

[m-kuhn]

Is your feature request related to a problem? Please describe.

The legacy provider is not found when built dynamically, most likely the search path is hardcoded to the original install dir.

This occurs for instance with py-requests-kerberos from https://github.com/open-vcpkg/python-registry is installed but also in
other scenarios, see #34949.

Typically, this happens if a cached openssl is used in a different install tree.

To workaround the issue, one can use a couple of approaches, either in the use application or with an env var, see openssl/openssl#18212.

Tested workaround: set(ENV{OPENSSL_MODULES} "${CURRENT_INSTALLED_DIR}/bin")

Proposed solution

openssl should be patched to be relocatable and support providers also when used from a different install tree.
Either in vcpkg, even better upstream.

Describe alternatives you've considered

#34949 discusses the alternative to build providers statically even if the port is built as dynamic, it remains unclear if this is a supported configuration by upstream, but would likely also fix the imminent issue.

Additional context

No response

[m-kuhn]

Should actually be: category:port-bug