Revert "Implement pthread_rwlock functions for NaCl newlib."

tests/threads/nacl.scons

 # -*- python -*-
 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 Import('env')
 
 # NOTE: the arm emulator does not handle atomic ops properly
 # NOTE: the default setting of 10k rounds is too slow on ARM
 EXTRA_ARGS = ['100']
@@ skipping 132 matching lines @@
     EXTRA_LIBS=['${PTHREAD_LIBS}', '${NONIRT_LIBS}'])
 
 node = env.CommandSelLdrTestNacl(
     'mutex_timedlock_test.out',
     mutex_timedlock_test_nexe
     )
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_mutex_timedlock_test',
                        is_broken=env.IsRunningUnderValgrind() or
                                  env.UsingEmulator())
 
-rwlock_test_nexe = env.ComponentProgram(
-    'rwlock_test',
-    ['rwlock_test.c'],
-    EXTRA_LIBS=['${PTHREAD_LIBS}', '${NONIRT_LIBS}'])
-
-node = env.CommandSelLdrTestNacl(
-    'rwlock_test.out',
-    rwlock_test_nexe
-    )
-env.AddNodeToTestSuite(node, ['small_tests'], 'run_rwlock_test',
-                       is_broken=env.IsRunningUnderValgrind() or
-                                 env.UsingEmulator())
-
 thread_stack_test_nexe = env.ComponentProgram('thread_stack_test',
                                               'thread_stack_test.c',
                                               EXTRA_LIBS=['${PTHREAD_LIBS}',
                                                           '${NONIRT_LIBS}'])
 
 node = env.CommandSelLdrTestNacl(
     'thread_stack_test.out',
     thread_stack_test_nexe,
     size='small',
     )
@@ skipping 88 matching lines @@
 
 # This tests an interface that is provided by nacl-newlib but not nacl-glibc.
 if not env.Bit('nacl_glibc'):
   stack_end_test_nexe = env.ComponentProgram(
       'stack_end_test', ['stack_end_test.c'],
       EXTRA_LIBS=['${PTHREAD_LIBS}', '${NONIRT_LIBS}'])
 
   node = env.CommandSelLdrTestNacl('stack_end_test.out',
                                    stack_end_test_nexe)
   env.AddNodeToTestSuite(node, ['small_tests'], 'run_stack_end_test')