Remove unneeded include from SkFloatingPoint.h.

The _POSIX_VERSION check was initially added in
https://skia.googlesource.com/skia/+/d3fbd34099, and its usage was
removed in https://skia.googlesource.com/skia/+/d7dc76f7e9. Since that's
long gone, remove the include associated with that. Then do IWYU to fix
the build.

Change-Id: Ic256d64a2e02bd8ada03513bb04b0e733576c474
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/482256
Auto-Submit: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
5 files changed