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Simple change to allow for LuaJIT 2.1 to be used with ModSecurity.
The issue happened due to luaL_setfuncs() already being defined in LuaJIT 2.1 (see lauxlib.h#L88).
Commit dee9898#diff-f120b67754e2c3ff8a98d4e3007f12efR111 defines this func as it is being used by the Lua engine inside ModSecurity (lua.cc#L138) but it is lacking in Lua 5.1 to make it compatible.
An extra if defined condition (WITH_LUA_JIT_2_1) was added to cover for LuaJIT 2.1.
Should fix #1909.