Hackish way of making NetRexxC.jar available to the Maven build without using a public repo.
Easy enough to run fetch.xml during Maven build, but complicated by fact that
system-scope dependencies are checked for existence before plugins get a chance
to run. Also complicated a bit by the fact that adding a plugin dependency to
maven-antrun-plugin (on commons-net:commons-net:1.4.0) does not seem to suffice
to let Ant load the <ftp> task (which does not support nested <classpath>).
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@960950 13f79535-47bb-0310-9956-ffa450edef68