AWS-LC is an OpenSSL derivative which can be used with the openssl plugin.
This adds a CI job that resembles the openssl-3 test case. It downloads
the source tarball for an AWS-LC release, builds that source using
CMake/Ninja, and then builds/tests strongSwan using the same technique
used by openssl-3.
References strongswan/strongswan#1907Closesstrongswan/strongswan#2151