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

src/untrusted/nacl/syscall_bindings_trampoline.h

 /*
  * 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.
  */
 /*
  * TODO(bradchen): figure out where to move this include file and then
  * move it.
  */
 
@@ skipping 240 matching lines @@
 
 typedef int (*TYPE_nacl_test_infoleak) (void);
 
 typedef int (*TYPE_nacl_test_crash) (int crash_type);
 
 typedef int (*TYPE_nacl_futex_wait_abs) (volatile int *addr, int value,
                                          const struct timespec *abstime);
 
 typedef int (*TYPE_nacl_futex_wake) (volatile int *addr, int nwake);
 
+typedef int (*TYPE_nacl_get_random_bytes) (void *buf, size_t buf_size);
+
 #if defined(__cplusplus)
 }
 #endif
 
 #endif  /*  NATIVE_CLIENT_SRC_UNTRUSTED_NACL_SYSCALL_BINDINGS_TRAMPOLINE_H */