FindOpenSSL: Add support for ARM64 Windows pre-built binaries

Matej Kendarequested to merge
matejk/cmake:openssl-arm64-windows into master

Modifications to find pre-built OpenSSL for ARM64 Windows pre-built binaries from Shining Light Productions.

https://slproweb.com/products/Win32OpenSSL.html

Backport: release

Edited by Brad King

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