Subcommands cannot be passed to stage2

The new `config` prevents subcommands such as `dist`, `svg` from being passed and handled by stage2.
```shell
$ ./nob help
[INFO] renaming ./nob -> ./nob.old
[INFO] CMD: cc -o ./nob nob.c
[INFO] deleting ./nob.old
[INFO] CMD: ./nob help
[INFO] --- STAGE 1 ---
[INFO] directory `build` already exists
[ERROR] Unknown command `help`
[ERROR] command exited with exit code 1
```
