graphics/{,py-}openimageio: sort out Makefile, remove unnecessary dependencies and pet portclippy

- Add VDB_IMPLIES=TBB: OpenVDB require TBB - build warning:
"Not using OpenVDB -- disabled (because TBB was not found)"
- Remove unused dependencies science/hdf5 and graphics/squish.
- Move devel/libfmt and graphics/libjpeg-turbo to BUILD_DEPENDS and
RUN_DEPENDS: check during configure stage and doesn't link this both.
- Force use devel/libfmt and textproc/pugixml from ports and prevent
use embedded copies.
- Remove GL=glew from IMAGEVIEWER - it doesn't link with libGLEW.
- Remove old and removed by upstream CMAKE options NOTHREADS,
USE_OPENSSL, USE_OPENGL.
- Sort options.

PR:		279454
Approved by:	Shane <FreeBSD@ShaneWare.Biz> (maintainer)