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

[Paul Norman]

> I am not sure too, Maybe for people unfamiliar with cmake? I just used it to fasten the build process on VMs (no need to do mkdir etc.). Different options can be placed in comments there too. But it can be removed.

I'd get rid of it.

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I'm going to put out a call for help testing this PR on different systems.

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