Add a get_random_bytes() syscall to replace the SRPC-based implementation

src/trusted/service_runtime/build.scons

 # -*- python -*-
 # Copyright (c) 2012 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 platform
 import os
 
 Import('env')
 
@@ skipping 61 matching lines @@
     'sel_qualify.c',
     'sel_validate_image.c',
     'sys_exception.c',
     'sys_fdio.c',
     'sys_filename.c',
     'sys_futex.c',
     'sys_imc.c',
     'sys_list_mappings.c',
     'sys_memory.c',
     'sys_parallel_io.c',
+    'sys_random.c',
     'thread_suspension_common.c',
     'thread_suspension_unwind.c',
 ]
 
 if env.Bit('build_x86_32'):
   ldr_inputs += [
       'arch/x86/nacl_ldt_x86.c',
       'arch/x86_32/nacl_app_32.c',
       'arch/x86_32/nacl_switch_32.S',
       'arch/x86_32/nacl_switch_all_regs_32.c',
@@ skipping 954 matching lines @@
                        is_broken=is_broken)
 
 dyn_array_test_exe = env.ComponentProgram('dyn_array_test',
                                           ['dyn_array_test.c'],
                                           EXTRA_LIBS=sel_ldr_libs)
 
 node = env.CommandTest('dyn_array_test.out',
                        command=[dyn_array_test_exe])
 
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_dyn_array_test')