[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++

It's part of the existing autoconf macros by Hartmut Holzgraefe. Perhaps it needs a function call to check linking? I don't know autotools well enough be sure.

Our bzip2 library is specific to osm2pgsql. I looked for an alternative one that is actively maintained by someone who understands autotools well so we wouldn't have to, but couldn't. I did find an alternative zlib one in the autoconf archive, but couldn't get it working.

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34865901
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