(svn r1696) Use GetTileSlope() instead of FindLandscapeHeightByTile() where it is sufficient. FindLandscapeHeightByTile() uses GetTileSlope() internally and adds some more info, which is discarded in these cases.
While touching the code make a bit more clear how GetBridgeHeight() works.

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// stdafx.cpp : source file that includes just the standard includes

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//	ttd.pch will be the pre-compiled header

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//	stdafx.obj will contain the pre-compiled type information

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#include "stdafx.h"

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// TODO: reference any additional headers you need in STDAFX.H

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// and not in this file