[Tile-serving] [openstreetmap/osm2pgsql] Multilinestrings built for relations with multi backend (#726)

[Sarah Hoffmann]

There is no build_both anymore. The caller must now decide in advance if they want a polygon or line. the problem is that currently the `do_split` parameter decides if a multiline is returned or multiple linestrings. To get the old behavior back, make `split_at` a parameter to the function and then call `get_wkb_multiline` with `do_split=true` and `split_at=100000000` (i.e. a very large value).

We should make split_at configurable, see also #677.

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