[Tile-serving] [osm2pgsql] Replace boost::unordered_map with std::unordered_map (#404)

[Paul Norman]

> @@ -4,7 +4,6 @@
>  #include "node-ram-cache.hpp"
>  
>  #include <boost/thread/thread.hpp>
> -#include <boost/unordered_map.hpp>

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