Add an OpenSSL library context

The context builds on CRYPTO_EX_DATA, allowing it to be dynamically
extended with new data from the different parts of libcrypto.

Reviewed-by: Mat

Add an OpenSSL library context

The context builds on CRYPTO_EX_DATA, allowing it to be dynamically
extended with new data from the different parts of libcrypto.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8225)

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