linux: Remove the use of OpenSSL Engine API

OpenSSL engines are not FIPS compatible and corresponding API
is deprecated since OpenSSL 3.0. It appears this API is not
actually used in the code, so remove it.

Signed-off-by: Tomas Bzatek <[email protected]>

Author: tbzatek

src/nvme/linux.c

@@ -18,7 +18,6 @@
 #include <unistd.h>
 
 #ifdef CONFIG_OPENSSL
-#include <openssl/engine.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
 #include <openssl/kdf.h>
@@ -739,9 +738,6 @@ int nvme_gen_dhchap_key(char *hostnqn, enum nvme_hmac_alg hmac,
 	_cleanup_hmac_ctx_ HMAC_CTX *hmac_ctx = NULL;
 	const EVP_MD *md;
 
-	ENGINE_load_builtin_engines();
-	ENGINE_register_all_complete();
-
 	hmac_ctx = HMAC_CTX_new();
 	if (!hmac_ctx) {
 		errno = ENOMEM;