[Tile-serving] [mod_tile] SCALE option to produce retina tiles (#82)

[apmon]

> @@ -244,7 +245,7 @@ static enum protoCmd render(struct xmlmapconfig * map, int x, int y, int z, char
>          Map map_parameterized = map->map; 
>          if (map->parameterize_function) 
>              map->parameterize_function(map_parameterized, options); 
> -        mapnik::agg_renderer<mapnik::image_32> ren(map_parameterized,buf); 
> +        mapnik::agg_renderer<mapnik::image_32> ren(map_parameterized,buf,map->scale);

Has this option of scale in the constructor always existed, or is this a new feature and needs to be protected by an ifdef MAPNIK_VERSION?

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https://github.com/openstreetmap/mod_tile/pull/82/files#r14724565
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