[Tile-serving] [openstreetmap/osm2pgsql] Remove dependency on libgen. (#970)

[Jochen Topf]

Removes the dependency on libgen including some CMake stuff for the
price of writing a small function ourselves.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/970

-- Commit Summary --

  * Remove dependency on libgen.

-- File Changes --

    M CMakeLists.txt (5)
    M options.cpp (14)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/970.patch
https://github.com/openstreetmap/osm2pgsql/pull/970.diff

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