Copy mod-eluna-lua-engine

Copy 35da9552ae here.

src/lualib/lua.hpp

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+// lua.hpp
+// Lua header files for C++
+// <<extern "C">> not supplied automatically because Lua also compiles as C++
+
+extern "C" {
+#include "lua.h"
+#include "lualib.h"
+#include "lauxlib.h"
+}