[Tile-serving] [osm2pgsql] Fix warnings when compiling tests, use -Werror with travis (#395)

[Paul Norman]

>      
>      version = BZ2_bzlibVersion();
> +    if (version == 0)
> +      ; // fixes error with -Werror=unused-but-set-variable on g++

and the `;` has to be on the second line for clang to not emit a warning

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34862013
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