Fix all header defines

src/qt/guiconstants.h

@@ -2,8 +2,8 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef GUICONSTANTS_H
-#define GUICONSTANTS_H
+#ifndef BITCOIN_QT_GUICONSTANTS_H
+#define BITCOIN_QT_GUICONSTANTS_H
 
 /* Milliseconds between model updates */
 static const int MODEL_UPDATE_DELAY = 250;
@@ -52,4 +52,4 @@ static const int MAX_PAYMENT_REQUEST_SIZE = 50000; // bytes
 #define QAPP_APP_NAME_DEFAULT "Bitcoin-Qt"
 #define QAPP_APP_NAME_TESTNET "Bitcoin-Qt-testnet"
 
-#endif // GUICONSTANTS_H
+#endif // BITCOIN_QT_GUICONSTANTS_H