(svn r27178) -Fix [FS#5969]: Data race due to lazy initialisation of objects.

src/station_base.h

@@ -37,6 +37,8 @@ class FlowStat {
 public:
 	typedef std::map<uint32, StationID> SharesMap;
 
+	static const SharesMap empty_sharesmap;
+
 	/**
 	 * Invalid constructor. This can't be called as a FlowStat must not be
 	 * empty. However, the constructor must be defined and reachable for