[includes] Enforce IWYU on SkCubicMap and SkGlyph

I was curious if these actually depended on PathOps or not.

SkCubicMap does not anymore, there was some #ifdef'd code
that currently exists in CubicMapTest.cpp anyway.

If we want SkGlyph in "core", we will want to remove the
dependency on pathops.

Change-Id: I9e2b7a37b5758d044575dad651d5bc1b203c070c
Bug: skia:13052, skia:13983
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/621199
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Owners-Override: Kevin Lubick <kjlubick@google.com>
6 files changed