[Tile-serving] [openstreetmap/osm2pgsql] autodestruct PGresult (#732)

[Sarah Hoffmann]

Wrap all instances of PGresult in a unique_ptr that automatically
calls PQclear on destruct to avoid accidental resource leaks.

Fixes #731.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/732

-- Commit Summary --

  * autodestruct PGresult

-- File Changes --

    M middle-pgsql.cpp (109)
    M output-gazetteer.cpp (19)
    M pgsql.cpp (45)
    M pgsql.hpp (19)
    M table.cpp (18)
    M table.hpp (16)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/732.patch
https://github.com/openstreetmap/osm2pgsql/pull/732.diff

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