[Tile-serving] [openstreetmap/osm2pgsql] Code cleanups (#585)

[Rolf Eike Beer]

 * removes some unused defines and feature tests
 * replaces C-style casts with C++ ones
 * replace 2 malloc() calls
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/585

-- Commit Summary --

  * remove some unused system checks and defines
  * replace C casts with C++ casts
  * replace malloc() with new
  * entirely avoid dynamic allocation for a single DWORD, put it on the stack

-- File Changes --

    M CMakeLists.txt (4)
    M cmake/config.h.in (3)
    M middle-pgsql.cpp (40)
    M pgsql.cpp (4)
    M sprompt.cpp (10)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/585.patch
https://github.com/openstreetmap/osm2pgsql/pull/585.diff

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