[Tile-serving] [openstreetmap/osm2pgsql] Multi statement queries (Issue #1994)

[Jochen Topf]

osm2pgsql uses "multi statement queries" in several places, i.e. one query that has more than one statement, for instance to PREPARE several queries. This is not supported by [Pgpool-II](https://www.pgpool.net/), see [their docs](https://www.pgpool.net/docs/pgpool-II-4.2.12/en/html/restrictions.html).

This is clearly a shortcoming in Pgpool-II and not the fault of osm2pgsql but it affects at least one osm2pgsql user (see #878 and https://www.pgpool.net/pipermail/pgpool-general/2023-July/008945.html) and is probably reasonably easy to work around.

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