Don't compile the Skia tools for PDK builds.

Change-Id: I9d64a065bf05d76e131b2d0ab73d136ebbae263f
Reviewed-on: https://skia-review.googlesource.com/5746
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Derek Sollenberger <djsollen@google.com>
2 files changed