Mark OCB as an AEAD cipher

OCB is AEAD capable but was not marked as such with the
EVP_CIPH_FLAG_AEAD_CIPHER flag.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

crypto/evp/e_aes.c

@@ -2684,8 +2684,11 @@ static int aes_ocb_cleanup(EVP_CIPHER_CTX *c)
     return 1;
 }
 
-BLOCK_CIPHER_custom(NID_aes, 128, 16, 12, ocb, OCB, CUSTOM_FLAGS)
-    BLOCK_CIPHER_custom(NID_aes, 192, 16, 12, ocb, OCB, CUSTOM_FLAGS)
-    BLOCK_CIPHER_custom(NID_aes, 256, 16, 12, ocb, OCB, CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes, 128, 16, 12, ocb, OCB,
+                    EVP_CIPH_FLAG_AEAD_CIPHER | CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes, 192, 16, 12, ocb, OCB,
+                    EVP_CIPH_FLAG_AEAD_CIPHER | CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes, 256, 16, 12, ocb, OCB,
+                    EVP_CIPH_FLAG_AEAD_CIPHER | CUSTOM_FLAGS)
 # endif                         /* OPENSSL_NO_OCB */
 #endif