Support OpenSSL 4.0

[vcsjones]

There are some changes that are going to be needed to support OpenSSL 4.0 when it is released, which is expected sometime in the spring.

• Teach OpenLibraryOnce about the .4 so object suffix.
• For portable builds with 3.0 headers, we need to teach it about OPENSSL_sk_set_thunks so that .NET Build against 3.0 headers functions correctly against 4.0
• There have been a number of pull requests to fix compilation against 4.0 headers, primarily that some things have been const-ified. We should decide what, if anything, gets back ported and to where.

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