[Tile-serving] [osm2pgsql] Add cmake build scripts and appveyor.yml (#460)

[Paul Norman]

With a standard build (``cmake ..``, no other options), how do I

* Build the tests, but not run them
* Run all the tests
* Run *a* test

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https://github.com/openstreetmap/osm2pgsql/pull/460#issuecomment-150988735
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