[Tile-serving] [openstreetmap/osm2pgsql] Remove an unused parameter and compile with -Wextra on travis (#701)

[Paul Norman]

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

  https://github.com/openstreetmap/osm2pgsql/pull/701

-- Commit Summary --

  * Remove unused parameter in constructor
  * Turn on -Wextra for travis

-- File Changes --

    M .travis.yml (6)
    M osmdata.cpp (16)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/701.patch
https://github.com/openstreetmap/osm2pgsql/pull/701.diff

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