Using the OpenSSL Dependency for Security Support and GDS

The GDS feature of Qt OPC UA as well as the security support for the Open62541 plugin requires the OpenSSL 3.x headers and libraries.

If OpenSSL is not installed to a path that is searched by default, the location of the headers and libraries must be passed to the build process.

For example, if OpenSSL has been installed to /opt/openssl, the locations must be passed as follows:

-DOPENSSL_ROOT_DIR=/opt/openssl/

The security capabilities of the Open62541 plugin and the GDS feature will be automatically disabled if OpenSSL is not detected during configuration.