temporarily disable emscripten on bots

Change-Id: I465c8dcd183a9f36784846e341ae1d9f701d8e10
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/259797
Auto-Submit: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed