[Tile-serving] [osm2pgsql] Cleanup includes and FIXED_POINT define (#356)

[Paul Norman]

travis is failing the clang builds with
```
In file included from parse.cpp:5:
./parse-pbf.hpp:42:8: error: definition of type 'ProtobufCBinaryData' conflicts
      with typedef of the same name
struct ProtobufCBinaryData;
       ^
/usr/include/google/protobuf-c/protobuf-c.h:94:37: note: 'ProtobufCBinaryData'
      declared here
typedef struct _ProtobufCBinaryData ProtobufCBinaryData;
                                    ^
1 error generated.
```

and the gcc builds with

```
/usr/include/c++/4.6/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the upcoming ISO C++ standard, C++0x. This support is currently experimental, and must be enabled with the -std=c++0x or -std=gnu++0x compiler options.
```

---
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https://github.com/openstreetmap/osm2pgsql/pull/356#issuecomment-105286741
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