NaCl: add missing GYP dependancies on pthread_lib.

ppapi/ppapi_nacl.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This GYP file defines untrusted (NaCl) targets.  All targets in this
 # file should be conditionally depended upon via 'disable_nacl!=1' to avoid
 # requiring NaCl sources for building.
 
 {
   'includes': [
@@ skipping 39 matching lines @@
         ],
       },
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
       ],
     },
     {
       'target_name': 'ppapi_nacl_tests',
       'type': 'none',
       'dependencies': [
+         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
          '<(DEPTH)/native_client/src/untrusted/nacl/nacl.gyp:nacl_lib',
+         '<(DEPTH)/native_client/src/untrusted/pthread/pthread.gyp:pthread_lib',
          'ppapi_cpp_lib',
          'native_client/native_client.gyp:ppapi_lib',
       ],
       'variables': {
         # This is user code (vs IRT code), so tls accesses do not
         # need to be indirect through a function call.
         'newlib_tls_flags=': [],
         # TODO(bradnelson): Remove this compile flag once new nacl_rev is
         # above 9362.
         'compile_flags': [
@@ skipping 209 matching lines @@
                 '>@(_inputs)',
                 '--output=>(nmf_pnacl)',
               ],
             },
           ],
         }],
       ],
     },
   ],
 }