RC4 is not a block cipher
RC4 is not a block cipher

RC4 is a stream cipher therefore EVP_CIPHER_CTX_block_size() should
return 1.

This fixes a test failure in ssl_test_old when enable-weak-ssl-ciphers
has been configured.

Reviewed-by: Richard Levitte <5fb523282dd7956571c80524edc2dccfa0bd8234@openssl.org>
Reviewed-by: Shane Lontis <452ce16516ceed26291fe7de3f8b53540d83864e@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10090)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl