(svn r14171) -Codechange: Make the test for HQ a bit lighter.

The presence of a HQ is only dictated by the 7th bit been set.
The rest of the data is related to the size and the type.

src/unmovable_map.h

@@ -83,7 +83,7 @@ static inline bool IsOwnedLandTile(TileIndex t)
 static inline bool IsCompanyHQ(TileIndex t)
 {
 	assert(IsTileType(t, MP_UNMOVABLE));
-	return IsInsideMM(GetUnmovableType(t), UNMOVABLE_HQ_NORTH, UNMOVABLE_HQ_END);
+	return HasBit(_m[t].m5, 7);
 }
 
 /**