[Tile-serving] [openstreetmap/osm2pgsql] Refactor getting read-only middle object (#871)

[Sarah Hoffmann]

Rewrite get_instance() to receive the shared pointer as a parameter
and get rid of the no_delete() hack which essentially renders the
shared pointer mute.

Also get rid of const for middle_query_t. There is no point in
adding this as the middle_query_t interface is completely const
already.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/871

-- Commit Summary --

  * refactor getting read-only middle object

-- File Changes --

    M middle-pgsql.cpp (44)
    M middle-pgsql.hpp (4)
    M middle-ram.cpp (17)
    M middle-ram.hpp (4)
    M middle.hpp (5)
    M osmdata.cpp (6)
    M tests/mockups.hpp (11)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/871.patch
https://github.com/openstreetmap/osm2pgsql/pull/871.diff

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