Clean up some platform_tools

The jetski build has been broken for a while now and depends on skia_internal
which I am trying to remove. If we need such a build, we can re-create
the Bazel rules.

skottielib does seem used (maybe just as an example), so I want to
make it explicit that we use the harfbuzz+ICU shaper. There will
be an internal CL to update the build targets. See http://cl/633662597

Change-Id: Ie7ab34640aa70979a333b1b54b09b981d9032104
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/854216
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
Auto-Submit: Kaylee Lubick <kjlubick@google.com>
4 files changed