Migrate HSW/SKX/PORTABLE flag cleanup block to skcms_internals.

All our our .cc's will need to agree on the value of these flags.

Change-Id: I3d26985cb9944493477158f544dd2a2bdd962044
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/776119
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed