crypto: fix missing OPENSSL_NO_ENGINE guard

Author: codebytere

src/crypto/crypto_context.cc

@@ -34,8 +34,10 @@ using ncrypto::BIOPointer;
 using ncrypto::ClearErrorOnReturn;
 using ncrypto::CryptoErrorList;
 using ncrypto::DHPointer;
-using ncrypto::EnginePointer;
 using ncrypto::EVPKeyPointer;
+#ifndef OPENSSL_NO_ENGINE
+using ncrypto::EnginePointer;
+#endif  // !OPENSSL_NO_ENGINE
 using ncrypto::MarkPopErrorOnReturn;
 using ncrypto::SSLPointer;
 using ncrypto::StackOfX509;

src/crypto/crypto_util.cc

@@ -30,7 +30,9 @@ using ncrypto::BignumPointer;
 using ncrypto::BIOPointer;
 using ncrypto::CryptoErrorList;
 using ncrypto::DataPointer;
+#ifndef OPENSSL_NO_ENGINE
 using ncrypto::EnginePointer;
+#endif  // !OPENSSL_NO_ENGINE
 using ncrypto::EVPKeyCtxPointer;
 using ncrypto::SSLCtxPointer;
 using ncrypto::SSLPointer;