COMPRESS-289 use a stable last modified time for long name entry,
based on patch by  Bob Robertson


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1626280 13f79535-47bb-0310-9956-ffa450edef68
record fix of COMPRESS-289

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1626284 13f79535-47bb-0310-9956-ffa450edef68