configure.in check for Lua does not set HAVE_LUA_H in some cases
configure.in, line 456 (in 1.4.3) uses "lua-config" to check for lua and get important paths. That's good, but if it finds and uses lua-config, we should set the "HAVE_LUA" and "HAVE_LUA_H" #defines. If this doesn't happen, mod_cml_lua.c becomes a big NO-OP, even though the user is believes mod_cml is up and running.
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