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

[alex85k]

Had simlar problems compiling for my non-root RHEL 4 system. 
Compilers can be changed by setting CC=path/to/gcc CXX=path/to/g++ or by specifying options
```
cmake -DCMAKE_C_COMPILER=... -DCMAKE_CXX_COMPILER=...
```
The path is almost ignored! 

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