[Tile-serving] [openstreetmap/osm2pgsql] C transforms future (#328)

[Jochen Topf]

>From what I have seen the Lua transforms are fast enough (and now with the flex backend flexible enough) that we can work towards getting rid of the c transforms at some point. We'll need to support them for backwards compatibility for a while, but once the flex backend stabilizes we can write a Lua script that exactly mimics their behaviour if that's needed. There is already a `compatible.lua` script that tries to do that, but it is untested.

Lua itself is stable enough and available on all platforms that we support, that keeping the option of compiling osm2pgsql without Lua support doesn't seem that important to me. There is only going to be a very small minority that will be happy with the inflexible and outdated c transforms anyway.

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