(svn r19299) -Codechange: store the most compatible ttd airport type in AirportSpec

-Fix: [NewGRF] return the ttd airport type in station var 0xF1

src/newgrf_airport.h

@@ -23,6 +23,14 @@ struct AirportTileTable {
 	StationGfx gfx;
 };
 
+/** TTDP airport types. Used to map our types to TTDPatch's */
+enum {
+	ATP_TTDP_SMALL,    ///< Same as AT_SMALL
+	ATP_TTDP_LARGE,    ///< Same as AT_LARGE
+	ATP_TTDP_HELIPORT, ///< Same as AT_HELIPORT
+	ATP_TTDP_OILRIG,   ///< Same as AT_OILRIG
+};
+
 /**
  * Defines the data structure for an airport.
  */
@@ -36,6 +44,7 @@ struct AirportSpec {
 	byte catchment;                        ///< catchment area of this airport
 	Year min_year;                         ///< first year the airport is available
 	Year max_year;                         ///< last year the airport is available
+	byte ttd_airport_type;                 ///< ttdpatch airport type (Small/Large/Helipad/Oilrig)
 
 	static const AirportSpec *Get(byte type);