Core/Crypto: Fixed build with openssl 1.1

(cherry picked from commit 9368823c8d)

src/common/Cryptography/ARC4.cpp

@@ -23,7 +23,7 @@ Trinity::Crypto::ARC4::ARC4() : _ctx(EVP_CIPHER_CTX_new())
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
     _cipher = EVP_CIPHER_fetch(nullptr, "RC4", nullptr);
 #else
-    _cipher = EVP_rc4();
+    EVP_CIPHER const* _cipher = EVP_rc4();
 #endif
 
     EVP_CIPHER_CTX_init(_ctx);

src/common/Cryptography/ARC4.h

@@ -38,7 +38,9 @@ namespace Trinity::Crypto
             template <typename Container>
             void UpdateData(Container& c) { UpdateData(std::data(c), std::size(c)); }
         private:
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
             EVP_CIPHER* _cipher;
+#endif
             EVP_CIPHER_CTX* _ctx;
     };
 }