[Tile-serving] [openstreetmap/osm2pgsql] many duplicate lines from relations (#772)

[Sarah Hoffmann]

I reopened to early. This is a data error. The example relation has tons of duplicate ways:

```
/tmp> wget -O r229600.osm http://www.openstreetmap.org/api/0.6/relation/229600
/tmp> sort r229600.osm | uniq -c | sort -n | tail -n 20
      2   <member type="way" ref="183114652" role=""/>
      2   <member type="way" ref="183114657" role=""/>
      2   <member type="way" ref="202974255" role=""/>
      2   <member type="way" ref="231932883" role=""/>
      2   <member type="way" ref="231932891" role=""/>
      2   <member type="way" ref="275144786" role=""/>
      2   <member type="way" ref="275144791" role=""/>
      2   <member type="way" ref="434973631" role=""/>
      2   <member type="way" ref="434973632" role=""/>
      4   <member type="way" ref="50287013" role=""/>
     32   <member type="way" ref="50640396" role=""/>
    127   <member type="way" ref="389995080" role=""/>
    132   <member type="way" ref="12859068" role=""/>
    132   <member type="way" ref="255519084" role=""/>
    132   <member type="way" ref="255519085" role=""/>
    132   <member type="way" ref="300785287" role=""/>
    132   <member type="way" ref="300785300" role=""/>
    132   <member type="way" ref="389995079" role=""/>
    132   <member type="way" ref="451280594" role=""/>
    132   <member type="way" ref="451280595" role=""/>
...

This is reflected in your database.


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