Merge V8 at 3.9.24.13

Bug: 5688872
Change-Id: Id0aa8d23375030494d3189c31774059c0f5398fc
diff --git a/tools/utils.py b/tools/utils.py
index fb94d14..232314c 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -61,6 +61,8 @@
     return 'openbsd'
   elif id == 'SunOS':
     return 'solaris'
+  elif id == 'NetBSD':
+    return 'netbsd'
   else:
     return None