message: fix missing header in aarch64 Nvidia Jetson
diff: @@ -26,7 +26,7 @@ namespace optimized_ops {
  // Enable for arm64 except for the Nvidia Linux 4 Tegra (L4T) running on
  // Jetson TX-2. This compiler does not support the offsetof() macro.
  #if defined(__aarch64__) && !defined(GOOGLE_L4T)
  -
  +#include <stddef.h>
  // clang-format gets confused with this file and ends up formatting lines to
  // be larger than 80 characters. Turn off here and back on at the end of the
  // file.
  