Remove ENGINE_load_dasync() (no OPENSSL_INIT_ENGINE_DASYNC already)
Fixes: 8d00e30f96fb86b20bc992f626b188c3548fc58c ("Don't try to init
dasync internally")
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
CLA: trivial