(svn r5594) Be more strict what's allowed to be built in a hangar: if the airport can't handle planes/helicopters don't present and disallow building planes/helicopters - the latter case wasn't covered yet.
Also remove an error message about building aircraft which can't be triggered by a normal client

/* $Id$ */

#ifndef VOID_MAP_H
#define VOID_MAP_H

static inline void MakeVoid(TileIndex t)
{
	SetTileType(t, MP_VOID);
	SetTileHeight(t, 0);
	_m[t].m1 = 0;
	_m[t].m2 = 0;
	_m[t].m3 = 0;
	_m[t].m4 = 0;
	_m[t].m5 = 0;
	_m[t].extra = 0;
}

#endif