eclipse:clean does not clean maven-eclipse.xml and .externalToolBuilders/Maven_Ant_Builder.launch [PATCH]

When specifying resource-folders within the pom an Ant-Script called maven-eclipse.xml and an externalToolBuilder (Maven_Ant_Builder.launch) will be generated. However these two files are not included when executing an eclipse:clean.

As I read in other posts eclipse:clean should restore the initial state of the project. That's why I attached a patch which cleans these two file, too.
Further junit tests are not needed as the existing tests cover the functionality already.

Regards,
Phillip