Replace exception by abort() in dummy HdfsEnv implementation.

Summary: Replace exception by abort() in dummy HdfsEnv implementation.

Test Plan: make dbg -j32

Reviewers: sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D29895

hdfs/env_hdfs.h

@@ -238,7 +238,7 @@ class HdfsEnv : public Env {
   explicit HdfsEnv(const std::string& fsname) {
     fprintf(stderr, "You have not build rocksdb with HDFS support\n");
     fprintf(stderr, "Please see hdfs/README for details\n");
-    throw std::exception();
+    abort();
   }
 
   virtual ~HdfsEnv() {