[Tile-serving] [openstreetmap/mod_tile] Write log to standard error (#219)

[ǝɹʇʇɐʃǝ◖ xıʃǝɟ]

This has been introduced with [this commit](https://github.com/openstreetmap/mod_tile/commit/a14924a999d0c465a023c02301964c41700744f1).

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