[canvaskit] Update to build with emscripten 1.38.47

Bug: skia:9052
Change-Id: Ic1aec2c9b8ace556f5b77862582894f59fd26b64
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247302
Reviewed-by: Kevin Lubick <kjlubick@google.com>
24 files changed