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

[Paul Norman]

> @@ -116,7 +116,7 @@ if (NOT Boost_ADDITIONAL_VERSIONS)
>  endif()
>  
>  # first try to find the version
> -find_package(Boost 1.50 REQUIRED COMPONENTS system filesystem thread ${BOOST_EXTRA})
> +find_package(Boost 1.50 REQUIRED COMPONENTS system filesystem ${BOOST_EXTRA})

If we don't need boost thread then `libboost-thread-dev` should be dropped Ubuntu/Debian and `libboost-thread1.55-dev` from travis.yml

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https://github.com/openstreetmap/osm2pgsql/pull/498/files#r44223600
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