fix plugins exclude so that it does not apply to the plugins dirs inside the built dirs
fix plugins exclude so that it does not apply to the plugins dirs inside the built dirs

nathandunn/jbrowse,GMOD/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,GMOD/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,nathandunn/jbrowse