HADOOP-9435.  Support building the JNI code against the IBM JVM.  (Tian Hong Wang via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505748 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5008. Merge change r1505761 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505764 13f79535-47bb-0310-9956-ffa450edef68