[fix] : Removed rebuild codes

Author: Hayao0819

allarch.sh

@@ -1387,8 +1387,6 @@ fi
 if [[ -d "${channel_dir}.add" ]]; then
     channel_name="${1}"
     channel_dir="${channel_dir}.add"
-elif [[ "${channel_name}" = "rebuild" ]]; then
-    msg_error "allarch.sh does not support rebuild." "1"
 elif [[ "${channel_name}" = "clean" ]]; then
    "${script_path}/tools/clean.sh" -w $(realpath "${work_dir}") $([[ "${debug}" = true ]] && echo -n "-d")
     exit 0