[Tile-serving] [osm2pgsql] building in readme (#520)

[Paul Norman]

https://github.com/openstreetmap/osm2pgsql/blob/master/README.md#building states

> Osm2pgsql uses the GNU Build System to configure and build itself and requires

It also omits any reference to boost

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/520
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