Switch to standard integer types in sandbox/.

sandbox/linux/system_headers/x86_64_linux_ucontext.h

 // Copyright 2014 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_SYSTEM_HEADERS_X86_64_LINUX_UCONTEXT_H_
 #define SANDBOX_LINUX_SYSTEM_HEADERS_X86_64_LINUX_UCONTEXT_H_
 
+#include <stdint.h>
+
 // We do something compatible with glibc. Hopefully, at some point Android will
 // provide that for us, and __BIONIC_HAVE_UCONTEXT_T should be defined.
 // Spec:
 // http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-AMD64/LSB-Core-AMD64/libc-ddefs.html#AEN5668
 
 #if !defined(__BIONIC_HAVE_UCONTEXT_T)
 #include <asm/sigcontext.h>
 
 struct _libc_fpxreg {
   unsigned short significand[4];
@@ skipping 61 matching lines @@
   mcontext_t uc_mcontext;
   sigset_t uc_sigmask;
   struct _libc_fpstate __fpregs_mem;
 } ucontext_t;
 
 #else
 #include <sys/ucontext.h>
 #endif  // __BIONIC_HAVE_UCONTEXT_T
 
 #endif  // SANDBOX_LINUX_SYSTEM_HEADERS_X86_64_LINUX_UCONTEXT_H_