use the copyright statement provided by the Lua distribution in lua.h

src/version.c

@@ -304,6 +304,9 @@ static struct rt_opt {
 } rt_opts[] = {
     { ":PATMATCH:", regex_id },
     { ":LUAVERSION:", (const char *) g.lua_ver + 3 }, /* +3 skip past "Lua" */
+#ifdef LUA_COPYRIGHT
+    { ":LUACOPYRIGHT:", (const char *) g.lua_copyright },
+#endif
 };
 
 /*
@@ -320,10 +323,11 @@ char *buf;
 
     if (!g.lua_ver[0])
         get_lua_version();
-        
+
     for (i = 0; i < SIZE(rt_opts); ++i) {
-        if (strstri(buf, rt_opts[i].token) && *rt_opts[i].value)
+        if (strstri(buf, rt_opts[i].token) && *rt_opts[i].value) {
             (void) strsubst(buf, rt_opts[i].token, rt_opts[i].value);
+	}
         /* we don't break out of the loop after a match; there might be
            other matches on the same line */
     }