[Tile-serving] [openstreetmap/osm2pgsql] Use C collation for ST_GeoHash ordering (#582)

[Paul Norman]

This avoids expensive UTF sorting when all we need is sorting by byte order.

Fixes #581
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/582

-- Commit Summary --

  * Use C collation for ST_GeoHash ordering

-- File Changes --

    M table.cpp (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/582.patch
https://github.com/openstreetmap/osm2pgsql/pull/582.diff

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