[Tile-serving] [openstreetmap/mod_tile] Add support for building & testing with upcoming Mapnik >= 4 (PR #305)

[Hummeltech]

@hummeltech commented on this pull request.



> -    MAPNIK_LDFLAGS=""
+    MAPNIK_LIBS=""

This variable was changed from `MAPNIK_LDFLAGS` to `MAPNIK_LIBS` in order to match the default variable names set up by `PKG_CHECK_MODULES`.

I.E.:
https://autotools.info/pkgconfig/pkg_check_modules.html#idm45459109695696

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