remove SkLiteDL

It's been dead code since it was inlined into Android last summer.

Change-Id: I252f6392d9436ef357f22a54bab8a33c9d1b3ea9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213625
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
20 files changed