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

[Jochen Topf]

> @@ -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, ...) {

The whole function should be refactored, probably taking a `std::vector<std::string>&` as argument instead of the variable argument list. This would make the code much cleaner and you don't have problems with references vs. values.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34762168
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