[canvaskit] Attempt to turn off rtti

This removes a little bit of hackery in paragraph bindings
that was needed to work around rtti and virtual methods
and embind.

Bug: skia:10794
Change-Id: I5ed15e805105bed866b9d6ebc0de1f70823d35ec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/324057
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
3 files changed