[Tile-serving] [mod_tile] Fix build against mapnik 3. (#87)

[Andrew Zaborowski]

No functional change, just conditionally use the new C++ syntax
required by mapnik 3.  Confirmed works.
You can merge this Pull Request by running:

  git pull https://github.com/balrog-kun/mod_tile master

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/mod_tile/pull/87

-- Commit Summary --

  * Fix build against mapnik 3.

-- File Changes --

    M src/gen_tile.cpp (12)
    M src/parameterize_style.cpp (27)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/87.patch
https://github.com/openstreetmap/mod_tile/pull/87.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/mod_tile/pull/87
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