[Tile-serving] [openstreetmap/osm2pgsql] Don't transform relation member tag for multi backend (#663)

[Paul Norman]

Fixes #659

To be able to process old-style multipolygons correctly it's necessary to have the untransformed tags for the rel_member transform, or else it's impossible to tell between some cases.

I'd like to backport this to fix the bug in 0.90.x, and if reasonable 0.88.x, so I've kept the diff minimal rather than looking for a cleaner way to pass the member tag information around.

I've formatted this with .clang-format from #662
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/663

-- Commit Summary --

  * Don't transform relation member tag for multi backend

-- File Changes --

    M geometry-processor.cpp (9)
    M geometry-processor.hpp (3)
    M output-multi.cpp (20)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/663.patch
https://github.com/openstreetmap/osm2pgsql/pull/663.diff

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