Remove third_party/ktx from Skia.

Change-Id: I3a1f68b0528f8789af5ccc0704b0a68fe14f52d3
Reviewed-on: https://skia-review.googlesource.com/8319
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
4 files changed