In the past, OpenSSL was not needed by the main libarchive when the hash

In the past, OpenSSL was not needed by the main libarchive when the hash
functions were provided by libc, e.g. on NetBSD. With the introduction
of the de-/encryption support, this is no longer the case. As such,
explicitly check for the necessary EVP routines as well to make sure
that -lcrypto is added as necessary.