move COPYRIGHT_YEAR to clientversion.h

- this allows usage of that information also in other places (e.g. splash
  screen)

src/clientversion.h

@@ -2,7 +2,7 @@
 #define CLIENTVERSION_H
 
 //
-// client versioning
+// client versioning and copyright year
 //
 
 // These need to be macros, as version.cpp's and bitcoin-qt.rc's voodoo requires it
@@ -14,6 +14,10 @@
 // Set to true for release, false for prerelease or test build
 #define CLIENT_VERSION_IS_RELEASE  false
 
+// Copyright year (2009-this)
+// Todo: update this when changing our copyright comments in the source
+#define COPYRIGHT_YEAR 2013
+
 // Converts the parameter X to a string after macro replacement on X has been performed.
 // Don't merge these into one macro!
 #define STRINGIZE(X) DO_STRINGIZE(X)

src/qt/aboutdialog.cpp

@@ -2,10 +2,7 @@
 #include "ui_aboutdialog.h"
 
 #include "clientmodel.h"
-
-// Copyright year (2009-this)
-// Todo: update this when changing our copyright comments in the source
-const int ABOUTDIALOG_COPYRIGHT_YEAR = 2013;
+#include "clientversion.h"
 
 AboutDialog::AboutDialog(QWidget *parent) :
     QDialog(parent),
@@ -14,7 +11,7 @@ AboutDialog::AboutDialog(QWidget *parent) :
     ui->setupUi(this);
 
     // Set current copyright year
-    ui->copyrightLabel->setText(tr("Copyright") + QString(" © ") + tr("2009-%1 The Bitcoin developers").arg(ABOUTDIALOG_COPYRIGHT_YEAR));
+    ui->copyrightLabel->setText(tr("Copyright") + QString(" © ") + tr("2009-%1 The Bitcoin developers").arg(COPYRIGHT_YEAR));
 }
 
 void AboutDialog::setModel(ClientModel *model)