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

[Paul Norman]

> @@ -129,7 +129,7 @@ const std::string &tempdb::conninfo() const {
>      return m_conninfo;
>  }
>  
> -void tempdb::setup_extension(conn_ptr db, const std::string &extension, ...) {
> +void tempdb::setup_extension(conn_ptr db, const std::string extension, ...) {

I'm not sure of a better way to handle this, but `va_start(ap, extension);` isn't valid with a reference type.

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34744127
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