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)