[Tile-serving] [osm2pgsql] Update lua autoconf macro (#188)

[Paul Norman]

I never could figure out how to report the issue to upstream, so I'm not sure if they're aware that ax_lua.m4 doesn't work on Ubuntu, Debian, or pretty much any system.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/188#issuecomment-73782701
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