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

[Paul Norman]

> put #define `_LARGEFILE_SOURCE` in `config.h`.

I think we could just leave it where it is, it's only needed for `lseek64` which is only in the flat-nodes code, and it only matters on 32-bit machines.

> Let's add `-Wall` to cmake then

Is there not a compiler-independent way of enabling warnings? Not all compilers use `-Wall` for all warnings.

> What about optimizations, debugging info

Our autotools setup doesn't really have release vs debug builds, so the cmake behavior seems sane. We might need to come back and tweak it. The one thing I'm not sure about is omitting debug info for release builds.

We should document how to do both a debug and a release build.

> geos-fallback?

Not needed on Ubuntu 12.04 anymore, so I'm fine with completely removing the files and any reference to them, but it'll need testing. If you don't want to do that in the scope of this PR, you could just replicate the current behavior.

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