[sksg] Fix WASM build

Bug: skia:
Change-Id: I62c18765d13e2b64ec06fc913e91a3b492fb022f
Reviewed-on: https://skia-review.googlesource.com/130132
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed