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

include/openssl/engine.h

diff --git a/include/openssl/engine.h b/include/openssl/engine.h
index 3bafa18..1544cc4 100644
--- a/include/openssl/engine.h
+++ b/include/openssl/engine.h
@@ -334,8 +334,6 @@
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_PADLOCK, NULL)
 #  define ENGINE_load_capi() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_CAPI, NULL)
-#  define ENGINE_load_dasync() \
-    OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_DASYNC, NULL)
 #  define ENGINE_load_afalg() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_AFALG, NULL)
 # endif