[Tile-serving] [osm2pgsql] Replace pthread and boost::thread with std::async (#498)

[Sarah Hoffmann]

> @@ -1,9 +1,10 @@
> +#include <cstdio>

I would consider <cstdio> a C++ header. The C header is called <stdio.h>. There is a subtle difference between two, for example, the former exports namespaces. 

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