message: util: Add __NR_copy_file_range syscall constant for sandbox
  Kernel 4.4.0 doesn't define this.
diff: @@ -58,6 +58,10 @@ bool g_syscall_sandbox_log_violation_before_terminating{false};
  #define __NR_membarrier 324
  #endif
  +#ifndef __NR_copy_file_range
  +#define __NR_copy_file_range 326
  +#endif
  +
  // This list of syscalls in LINUX_SYSCALLS is only used to map syscall numbers to syscall names in
  // order to be able to print user friendly error messages which include the syscall name in addition
  // to the syscall number.
  