it uses a pathconvert to get a list of files
and compares this to a list of files returned in the Length
task. The order of files in a fileset is not defined, and on
my machine it is a different order that than returned by
the Length task.
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@277298 13f79535-47bb-0310-9956-ffa450edef68