Move wizards' cancel button to the left on Mac.

It is too far to the left now, but that can't be helped
(it's a Qt limitation).

Task-number: QTCREATORBUG-6156
Change-Id: I0201356234abb618dc3b573673d512c0a97c4839
Reviewed-on: http://codereview.qt-project.org/5406
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/coreplugin/basefilewizard.cpp

@@ -539,6 +539,16 @@ void BaseFileWizard::setupWizard(QWizard *w)
     w->setOption(QWizard::NoDefaultButton, false);
     w->setOption(QWizard::NoBackButtonOnStartPage, true);
     w->setWindowFlags(w->windowFlags() & ~Qt::WindowContextHelpButtonHint);
+
+#ifdef Q_OS_MAC
+    w->setButtonLayout(QList<QWizard::WizardButton>()
+                    << QWizard::CancelButton
+                    << QWizard::Stretch
+                    << QWizard::BackButton
+                    << QWizard::NextButton
+                    << QWizard::CommitButton
+                    << QWizard::FinishButton);
+#endif
 }
 
 /*!