[Tile-serving] [osm2pgsql] Enable OS X support for Travis (#443)

[Paul Norman]

This also turns CXXFLAGS into a variable, as there are still some warnings being produced on OS X.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/443

-- Commit Summary --

  * Enable OS X support for Travis

-- File Changes --

    M .travis.yml (15)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/443.patch
https://github.com/openstreetmap/osm2pgsql/pull/443.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/443
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