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

sandbox/linux/services/android_arm_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_ARM_UCONTEXT_H_
 #define SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_
 
 #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;
 
-// sigset_t from arch/arm/include/asm/signal.h in the Linux kernel.
-typedef struct {
-  unsigned long sig[64 / 8 / sizeof(long)];  // Always 64 bits (yes we assume
-                                             // 8 bits per char).
-} android_header_sigset_t;  // Change name to avoid collissions if sigset_t
-                            // gets defined in newer Android headers.
-
 //typedef unsigned long sigset_t;
 typedef struct ucontext {
   unsigned long   uc_flags;
   struct ucontext  *uc_link;
   stack_t     uc_stack;
   struct sigcontext uc_mcontext;
   sigset_t    uc_sigmask;
   /* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
-  int     __not_used[32 - (sizeof (android_header_sigset_t) / sizeof (int))];
+  int     __not_used[32 - (sizeof (sigset_t) / sizeof (int))];
   /* Last for extensibility.  Eight byte aligned because some
      coprocessors require eight byte alignment.  */
   unsigned long   uc_regspace[128] __attribute__((__aligned__(8)));
 } ucontext_t;
 
 #else
 #include <sys/ucontext.h>
 #endif  // __BIONIC_HAVE_UCONTEXT_T
 
 #endif  // SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_