[MNG-6995] Support core extensions in modules of aggregator projects

**[mike duigou](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=bondolo)** opened **[MNG-6995](https://issues.apache.org/jira/browse/MNG-6995?redirect=false)** and commented

If you have defined core extensions using the MNG-5771 .mvn/extensions.xml mechanism and then include the module in an aggregator pom the extensions will currently be ignored. Only extensions defined in same directory as the aggregator pom will be used and those extensions will not be invoked for the modules, only for the aggregator itself.

Ideally modules should build with whatever core extensions they have defined. Building a module as part of an aggregator should behave not differently than building the module standalone.

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**Affects:** 3.6.3

1 votes, 4 watchers