HADOOP-9718. Branch-1-win TestGroupFallback#testGroupWithFallback() failed caused by java.lang.UnsatisfiedLinkError. Contributed by Xi Fang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1501896 13f79535-47bb-0310-9956-ffa450edef68