Remove sk_float|double macros which mirror <cmath> functions.

We don't need fixed-point scalars in Skia anymore, so these layers
of indirection don't add any value.

Change-Id: I68d7f5a02cdd9a2c78c95acfca87b6d1ebc5ecec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/842498
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
30 files changed