[Tile-serving] [osm2pgsql] Unnecessary inclusion of libdl (#141)

[Jochen Topf]

Yes, I compiled with lua support. (In fact, I don't know how to disable it.) It seems liblua depends on libdl. So having an extra dependency on libdl from osm2pgsql itself probably doesn't really matter. There might be some startup cost or so, but maybe not. Building `osm2pgsql` without `-ldl` works fine, but it still depends on `libdl` as can be seen with `ldd osm2pgsql`.

As a side note: Playing around with this I noticed something else: `nodecachefilereader` is linked with the same libs as `osm2pgsql`, half of which are probably unnecessary.

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https://github.com/openstreetmap/osm2pgsql/issues/141#issuecomment-42215149
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