compiler segfault when building a `static-lib` with `-o somedir/...`

```console
$ c3c static-lib test.c3 -o test/a.a
fish: Job 1, 'c3c static-lib test.c3 -o test/…' terminated by signal SIGSEGV (Address boundary error)
```
it doesn't crash if `test/` isn't included after -o