Allow export full perm item on opensim if it doesn't support the export bit.

This addresses
https://code.google.com/p/singularity-viewer/issues/detail?id=1003

indra/newview/lfsimfeaturehandler.h

@@ -19,6 +19,7 @@
 #define LFSIMFEATUREHANDLER_H
 
 #include "llsingleton.h"
+#include "llpermissions.h"	// ExportPolicy
 
 template<typename Type>
 class SignaledType
@@ -64,6 +65,7 @@ public:
 	bool simSupportsExport() const { return mSupportsExport; }
 	std::string mapServerURL() const { return mMapServerURL; }
 	std::string searchURL() const { return mSearchURL; }
+	ExportPolicy exportPolicy() const;
 
 private:
 	// SignaledTypes