Add build-fi to the ignore lists.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hdfs/trunk@794921 13f79535-47bb-0310-9956-ffa450edef68

.gitignore

@@ -19,6 +19,7 @@
 .settings
 .svn
 build/
+build-fi/
 conf/masters
 conf/slaves
 conf/hadoop-env.sh