[Tile-serving] [osm2pgsql] Change z_order of link roads (#132)

[Paul Norman]

> I wonder how much of the penalty is due to the conversion of parameters from C to lua and back. Maybe there is room for improvement there.

I should note that this was a few versions ago, and both the c and lua transforms have had some changes since then. The slowdown is also obviously going to depend on CPU bound vs disk bound.

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https://github.com/openstreetmap/osm2pgsql/issues/132#issuecomment-43544274
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