Android make sandbox/linux/seccomp-bpf compile on i386

sandbox/linux/services/android_x86_ucontext.h

-// Copyright (c) 2012 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.
-
-#ifndef SANDBOX_LINUX_SERVICES_ANDROID_X86_UCONTEXT_H_
-#define SANDBOX_LINUX_SERVICES_ANDROID_X86_UCONTEXT_H_
-
-// This is basically include/uapi/asm-generic/ucontext.h from the Linux kernel.
-// In theory, Android libc's could expand the structure for its own internal
-// use, but if the libc provides an API that expects this expanded structure,
-// __BIONIC_HAVE_UCONTEXT_T should be defined.
-
-#if !defined(__BIONIC_HAVE_UCONTEXT_T)
-#include <asm/sigcontext.h>
-
-// We also need greg_t for the sandbox, include it in this header as well.
-typedef unsigned long greg_t;
-
-typedef struct ucontext {
-  unsigned long   uc_flags;
-  struct ucontext  *uc_link;
-  stack_t     uc_stack;
-  struct sigcontext uc_mcontext;
-  sigset_t    uc_sigmask; /* mask last for extensibility */
-} ucontext_t;
-
-#else
-#include <sys/ucontext.h>
-#endif  // __BIONIC_HAVE_UCONTEXT_T
-
-#endif  // SANDBOX_LINUX_SERVICES_ANDROID_X86_UCONTEXT_H_