[Tile-serving] [osm2pgsql] Make more of osm2pgsql threading aware (#110)

[Sarah Hoffmann]

>      }
>  
> -    return 0;
> +    return ctx;
>  #else
>      fprintf(stderr,"Error: Could not init lua tag transform, as lua support was not compiled into this version\n");
>      return 1;

should be return NULL

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https://github.com/openstreetmap/osm2pgsql/pull/110/files#r8326035
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