Move thread_pool.h into utils so it can be shared by more than one example.

native_client_sdk/src/libraries/nacl_io/library.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win'],
   'SEARCH': [
     '.',
     'pepper',
     '../utils'
   ],
   'TARGETS': [
     {
       'NAME' : 'nacl_io',
@@ skipping 55 matching lines @@
       ],
       'DEST': 'include/nacl_io',
     },
     {
       'FILES': [
         "all_interfaces.h",
         "define_empty_macros.h",
         "undef_macros.h",
       ],
       'DEST': 'include/nacl_io/pepper',
-    },
-    {
-      'FILES': [
-        "auto_lock.h",

[binji, 2013/06/04 23:30:28]

what .dsc copies these files now? did you forget to upload it?

[nfullagar1, 2013/06/04 23:47:09]

Missed the svn add!  should be there now

-        "macros.h",
-        "ref_object.h"
-      ],
-      'DEST': 'include/utils',
     }
   ],
   'DEST': 'src',
   'NAME': 'nacl_io',
 }