Basic option processing is still broken for REPL

## Compiler version

3.1.0-RC1-bin-SNAPSHOT

## Minimized code

```Scala
✗ ./bin/scala -source 3.0-migration
Exception in thread "main" java.nio.file.NoSuchFileException: -source
```

## Output

```scala
// As shown.
```

## Expectation

Processing command line options for the compiler, with additional REPL-specific options.
