Add SkottieUtils src/hdr defines to public.bzl

TBR=
Change-Id: I290f0af76862bf4f6a35f5d53f7a0ab44dc16ec8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/298345
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
1 file changed