remove conditional flags for sksg -- not needed for a module

Bug: skia:
Change-Id: I1b73379bd8a1ba2cd4293180052ba7ad59dfe96f
Reviewed-on: https://skia-review.googlesource.com/144642
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed