Ensure the EVP_PKEY operation_cache is appropriately locked
The EVP_PKEY operation_cache caches references to provider side key objects that have previously been exported for this EVP_PKEY, and their associated key managers. The cache may be updated from time to time as the EVP_PKEY is exported to more providers. Since an EVP_PKEY may be shared by multiple threads simultaneously we must be careful to ensure the cache updates are locked. Fixes #13818 Reviewed-by: NPaul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/13987)
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