[Tile-serving] [osm2pgsql] Replace manually allocated strings in middle-pgsql with std::string (#248)

[Paul Norman]

note: timing 66f645a24585d548b6ea81aaadc43b5919c77060 and 282c51bd81b8965aee39dd48bd3fa09b83d8c75b

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https://github.com/openstreetmap/osm2pgsql/pull/248#issuecomment-69473202
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