[Tile-serving] [openstreetmap/osm2pgsql] Enable LuaJIT by default and document it (#911)

[Paul Norman]

LuaJIT provides a significant speedup while requiring no change in usage, making complex Lua transforms as fast as the C transforms.

To do:

Double-check install instructions on 
- [] Debian
- [] Ubuntu
- [] Fedora
- [] CentOS
- [] FreeBSD
- [] Windows

c.f. https://github.com/openstreetmap/osm2pgsql/issues/801#issuecomment-462235378
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/911

-- Commit Summary --

  * Enable LuaJIT by default and document it

-- File Changes --

    M CMakeLists.txt (2)
    M README.md (16)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/911.patch
https://github.com/openstreetmap/osm2pgsql/pull/911.diff

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