[syslog] Port includes to use SDK path Change-Id: Id751e20cfcaabbdaa7b1f183e899e272a842c24b Reviewed-on: https://fuchsia-review.googlesource.com/c/libc-tests/+/548801 Fuchsia-Auto-Submit: Shai Barack <shayba@google.com> Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com> Reviewed-by: Christopher Johnson <crjohns@google.com>