Remove duplicate entry `MRB_USE_ALL_SYMBOLS`
@@ -247,11 +247,6 @@ largest value of required alignment.
- Make it available `Symbol.all_symbols` in `mrbgems/mruby-symbol-ext`
- Increase heap memory usage.
-`MRB_USE_ALL_SYMBOLS`
-
-- Make it available `Symbol.all_symbols` in `mrbgems/mruby-symbol-ext`
-- Increase heap memory usage.
-
`MRB_NO_DIRECT_THREADING`
- Turn off direct threading optimization in VM loop
