[MCHECKSTYLE-454] Running checkstyle:check when the project is on a path with accents fails

**[Emmanuel Lécharny](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=elecharny)** opened **[MCHECKSTYLE-454](https://issues.apache.org/jira/browse/MCHECKSTYLE-454?redirect=false)** and commented

PS: also tested with 3.6.0 which has been released, but you haven't marked it as released in JIRA...

If the project I want to check is under a directory where a part of the path contain accents, like:

```
/user/elecharny/téléchargement/apache-sshd-2.15.9
```

then the checkstyle configuration file(in my case, sshd-checkstyle.xml) is either not found, or ignored.

If I rename `téléchargement` to `download`, all is fine.

---

**Affects:** 3.4.0, 3.5.0, 3.6.0

Start by reproducing `checkstyle:check` with the project path containing `téléchargement`, using the mentioned `sshd-checkstyle.xml` configuration, then compare it with the same project under an ASCII-only path. Done means the configuration is found and applied consistently for accented and non-accented paths across the affected plugin versions.

Written by the indexing model from the issue text.