[MNG-8383] Non jar files are added to the classpath

**[Guillaume Nodet](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=gnt)** opened **[MNG-8383](https://issues.apache.org/jira/browse/MNG-8383?redirect=false)** and commented


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**Affects:** 4.0.0-beta-5

**Remote Links:**
- [GitHub Pull Request #1921
](https://github.com/apache/maven/pull/1921)

**Backported to:** [4.0.0-rc-1](https://github.com/apache/maven/milestone/26?closed=1)
