[Tile-serving] [openstreetmap/osm2pgsql] Undefined behaviour in boost triggered by test code (#1028)

[Jochen Topf]

These lines

https://github.com/openstreetmap/osm2pgsql/blob/master/tests/test-output-pgsql-int4.cpp#L33-L34
https://github.com/openstreetmap/osm2pgsql/blob/master/tests/test-output-pgsql-int4.cpp#L48-L49

trigger an undefined behaviour in the boost `lexical_cast` function are reported by the clang UB sanitizer:
```
/usr/include/boost/lexical_cast/detail/converter_lexical_streams.hpp:554:51: runtime error: unsigned integer overflow: 0 - 15000 cannot be represented in type 'unsigned int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/include/boost/lexical_cast/detail/converter_lexical_streams.hpp:554:51 in 
```

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