Make OpenSSL tests less dependent on system config

It fixes dependencies on system config if running tests with OpenSSL 3.0

Fork openssl_error_string() test for OpenSSL

The used error code differ signficantly, so use a separate test
file.

openssl_encrypt() no longer throws an error for invalid key le

Fork openssl_error_string() test for OpenSSL

The used error code differ signficantly, so use a separate test
file.

openssl_encrypt() no longer throws an error for invalid key length,
which looks like an upstream bug.

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