Fix build on IBM JDK

It was failing with enforcer failing ban transitive dependencies.

```
[INFO] --- maven-enforcer-plugin:1.3.1:enforce (ban-transitive-deps) @ wildfly-feature-pack ---
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.BanTransitiveDependencies failed with message:
org.wildfly:wildfly-feature-pack:pom:9.0.0.Alpha2-SNAPSHOT
   org.apache.ws.xmlschema:xmlschema-core:jar:2.0.2:compile has transitive dependencies:
      xalan:xalan:jar:2.7.1.jbossorg-1:compile
         xalan:serializer:jar:2.7.1.jbossorg-1:compile
```