Cleaner port of Ansariel's fix for Attachment loss on TP/Crossing

indra/newview/llagent.h

@@ -739,6 +739,13 @@ private:
  **                                                                            **
  *******************************************************************************/
 
+	// Attachments getting lost on TP
+public:
+	void setIsCrossingRegion(bool is_crossing) { mIsCrossingRegion = is_crossing; }
+	bool isCrossingRegion() const { return mIsCrossingRegion; }
+private:
+	bool mIsCrossingRegion;
+
 	// Build
 public:
 	bool			canEditParcel() const { return mCanEditParcel; }