[Tile-serving] [openstreetmap/osm2pgsql] Check if way-node index exists before enabling forward dependencies (Issue #1814)

[Jochen Topf]

We don't have the name of the index, but this should probably work:
```
SELECT count(*) FROM pg_indexes WHERE tablename='{prefix}ways' AND indexdef LIKE '%nodes%';
```
If the result is >0, the index is there.

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