Add libhdfs.a to the build process.

Fix compilcation error for hdfs build.

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Blame Rev:

hdfs/env_hdfs.h

@@ -127,7 +127,7 @@ class HdfsEnv : public Env {
   }
 
   virtual Status GetCurrentTime(int64_t* unix_time) {
-    return posixEnv->NowUnixTime(unix_time);
+    return posixEnv->GetCurrentTime(unix_time);
   }
 
   virtual Status GetAbsolutePath(const std::string& db_path,