[Tile-serving] [osm2pgsql] Remove the lockfree queue option (#364)

[Sarah Hoffmann]

One option to speed up the mutex version is to retrieve batches of objects from the queue instead of single ones.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/364#issuecomment-117937633
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