[sparkplug] Fix Batch compilation on unsupported platforms

Few of the changes added under https://crrev.com/c/2891656
do not compile if sparkplug is not implement on a platform.

Bug: v8:11790, v8:11421
Change-Id: Iec40e89ab56a6923b30a5567e4a49e4f1763eece
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2933656


Reviewed-by: Patrick Thier <pthier@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74921}