fix android build

Change-Id: I55ff31b40366398b6159ee7a99c75e393a05b36a

vcl/null/printerinfomanager.cxx

@@ -21,9 +21,18 @@
 
 #include "unx/gendata.hxx"
 
+// needed since we declare a std::unique_ptr<SystemQueueInfo>
+namespace psp
+{
+    class SystemQueueInfo
+    {
+    };
+}
+
 using namespace psp;
 using namespace osl;
 
+
 PrinterInfoManager& PrinterInfoManager::get()
 {
     SalData* pSalData = GetSalData();