add function to disable CPU detection

Might as well make this a real skcms API.

Bug: skia:10009
Change-Id: Ie901405527d24b87a9463dda1c52ec123a12ca1f
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/291830
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed