Use QWeakPointer instead of QPointer for too old versions of Qt

Use QString instead of QStringLiteral for too old versions of Qt

kstyle/breeze.h

@@ -30,6 +30,7 @@
 #include <QFlags>
 #include <QPointer>
 #include <QScopedPointer>
+#include <QWeakPointer>
 
 namespace Breeze
 {
@@ -37,12 +38,22 @@ namespace Breeze
     //!@name convenience typedef
     //@{
 
+    #if QT_VERSION >= 0x050000
     //! scoped pointer convenience typedef
     template <typename T> using WeakPointer = QPointer<T>;
+    #else
+    //! scoped pointer convenience typedef
+    template <typename T> using WeakPointer = QWeakPointer<T>;
+    #endif
 
     //! scoped pointer convenience typedef
     template <typename T> using ScopedPointer = QScopedPointer<T, QScopedPointerPodDeleter>;
 
+    //! disable QStringLiteral for older Qt version
+    #if QT_VERSION < 0x050000
+    using QStringLiteral = QString;
+    #endif
+
     //@}
 
     //! metrics