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

[Paul Norman]

>  
> -    ./autogen.sh
> +    mkdir build && cd build
> +    cmake .. -G "Unix Makefiles"

is `-G "Unix Makefiles"` required

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https://github.com/openstreetmap/osm2pgsql/pull/460/files#r42318337
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