Remove Qt version checks.

Qt 5.3 is the minimum requirement these days. Remove all fallback code
from sources and project files.

Change-Id: If6188a471197acadda4d6baee71804ba1a8026c6
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/libs/utils/consoleprocess_p.h

@@ -43,11 +43,7 @@ class QTimer;
 QT_END_NAMESPACE
 
 #ifdef Q_OS_WIN
-#  if QT_VERSION >= 0x050000
-#    include <QWinEventNotifier>
-#  else
-#    include <private/qwineventnotifier_p.h>
-#  endif
+#  include <QWinEventNotifier>
 #  include <windows.h>
 #endif