fix class path if `HAXE_STD_PATH` is set (see #4163)
fix class path if `HAXE_STD_PATH` is set (see #4163)

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe