[Tile-serving] [openstreetmap/osm2pgsql] make PROJ library optional (#1066)

[Sarah Hoffmann]

If the proj library cannot be found by cmake, do not offer
the option to use arbitrary projections.

Also changes reprojection interface to return managed pointers
for the projection.

Fixes #1065.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1066

-- Commit Summary --

  * make PROJ library optional

-- File Changes --

    M CMakeLists.txt (15)
    M cmake/config.h.in (1)
    M src/CMakeLists.txt (6)
    M src/options.cpp (23)
    A src/reprojection-generic-none.cpp (8)
    A src/reprojection-generic-proj4.cpp (62)
    M src/reprojection.cpp (55)
    M src/reprojection.hpp (11)
    M tests/common-options.hpp (3)
    M tests/test-options-projection.cpp (3)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1066.patch
https://github.com/openstreetmap/osm2pgsql/pull/1066.diff

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