Make gclient pack work again by not prefixing "thread_id>"

gclient.py

Index: gclient.py
===================================================================
--- gclient.py	(revision 135106)
+++ gclient.py	(working copy)
@@ -1282,6 +1282,8 @@
                          'platform(s); \'all\' will process all deps_os '
                          'references')
   (options, args) = parser.parse_args(args)
+  # Force jobs to 1 so the stdout is not annotated with the thread ids 
+  options.jobs = 1
   client = GClient.LoadCurrentConfig(options)
   if not client:
     raise gclient_utils.Error('client not configured; see \'gclient config\'')