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

[Paul Norman]

> Have two warnings in cmake build, can not apply -Werror (some flags??) https://travis-ci.org/openstreetmap/osm2pgsql/jobs/85616194

libosmium should be included with `-isystem`

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CMakeLists.txt doesn't have a consistent style for if statements, it uses `if(foo)`, `if (foo)`, `if ( foo )`. Unless there's a specific cmake convention otherwise, `if (foo)` is consistent with the C++ code

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