Fix Mac breakage by adding iostream.

Change-Id: I027a81926cecdb1783f265c87385ddd498d27da6
diff --git a/lib/Support/Path.cpp b/lib/Support/Path.cpp
index 8cc384d..55baa52 100644
--- a/lib/Support/Path.cpp
+++ b/lib/Support/Path.cpp
@@ -12,6 +12,7 @@
 
 #include <locale>
 #include <string.h>
+#include <iostream>
 
 using namespace mcld;
 using namespace mcld::sys::fs;
@@ -205,4 +206,3 @@
 {
   return pOS << pPath.native();
 }
-