Common/Crypto: Reduce differences between 3.3.5 and 6.x branches

Code functionality shouldn't have been modified.

src/common/Configuration/Config.cpp

@@ -21,7 +21,6 @@
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/ini_parser.hpp>
 #include "Config.h"
-#include "Errors.h"
 #include "Log.h"
 
 using namespace boost::property_tree;

src/common/Cryptography/BigNumber.cpp

@@ -18,7 +18,6 @@
 
 #include "Cryptography/BigNumber.h"
 #include <openssl/bn.h>
-#include <openssl/crypto.h>
 #include <cstring>
 #include <algorithm>
 #include <memory>