[Tile-serving] [osm2pgsql] avoid duplicates in job queues for pending ways and relations (#420)

[Paul Norman]

Passing all tests. Admittedly, this is something hard to test as what amounts to a race condition can mask the error, but it should not introduce any bugs.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/420#issuecomment-126807112
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