Always build in C++11 mode

refs: #1930

Change-Id: Iedad4a814e5c7e6a5486f2f7e16c45c356131792
diff --git a/nsync/sync-state-leaf-container.h b/nsync/sync-state-leaf-container.h
index 48819aa..d14e635 100644
--- a/nsync/sync-state-leaf-container.h
+++ b/nsync/sync-state-leaf-container.h
@@ -17,7 +17,7 @@
  *
  * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
  *         Chaoyi Bian <bcy@pku.edu.cn>
- *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
  */
 
 #ifndef SYNC_STATE_LEAF_CONTAINER
@@ -66,7 +66,7 @@
   }
 };
 
-/// @cond include_hidden 
+/// @cond include_hidden
 struct hashed { };
 struct ordered { };
 /// @endcond
@@ -85,7 +85,7 @@
       NameInfoHash,
       NameInfoEqual
       >,
-        
+
     mi::ordered_unique<
       mi::tag<ordered>,
       mi::const_mem_fun<Leaf, NameInfoConstPtr, &Leaf::getInfo>,