esp: don't use EVP_add_cipher_alias().

esp: don't use EVP_add_cipher_alias().

It's described in
https://github.com/openssl/openssl/issues/11715#issuecomment-2164442688
as being one of several routines that "are internal macros and not
really suitable for the Brave New Provider World", and the bug in
question complains that they're not documented.

Instead, just map "3des" to "des-ede3-cbc" ourselves.

This should fix #1175.