Fetch char once from array

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1465504 13f79535-47bb-0310-9956-ffa450edef68
IO-375 FilenameUtils.splitOnTokens(String text) check for '**' could be simplified 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1465505 13f79535-47bb-0310-9956-ffa450edef68