[ffmpeg] simplify openssl library search, and fix linux openssl feature linking #14388
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What does your PR fix? Fixes linking of openssl on x64-linux, whilst also simplifying openssl library search code (thanks to the work done in [OpenSSL] refactor openssl ports. #14308).
Which triplets are supported/not supported? Have you updated the CI baseline? No changes.
Does your PR follow the maintainer guide? To the best of my knowledge, yes.