Unshield include fix

apps/wizard/mainwizard.cpp

@@ -15,10 +15,13 @@
 #include "existinginstallationpage.hpp"
 #include "installationtargetpage.hpp"
 #include "componentselectionpage.hpp"
-#include "installationpage.hpp"
 #include "importpage.hpp"
 #include "conclusionpage.hpp"
 
+#ifdef OPENMW_USE_UNSHIELD
+#include "installationpage.hpp"
+#endif
+
 using namespace Process;
 
 Wizard::MainWizard::MainWizard(QWidget *parent) :