(svn r11411) -Codechange: implement random triggers for houses.

src/town_map.h

@@ -299,6 +299,19 @@ static inline Year GetHouseConstructionYear(TileIndex t)
 	return IsHouseCompleted(t) ? _m[t].m5 + ORIGINAL_BASE_YEAR : 0;
 }
 
+/**
+ * Set the random bits for this house.
+ * This is required for newgrf house
+ * @param t      the tile of this house
+ * @param random the new random bits
+ * @pre IsTileType(t, MP_HOUSE)
+ */
+static inline void SetHouseRandomBits(TileIndex t, byte random)
+{
+	assert(IsTileType(t, MP_HOUSE));
+	_m[t].m1 = random;
+}
+
 /**
  * Get the random bits for this house.
  * This is required for newgrf house