graphics/opensubdiv: sort out Makefile, pet portclippy, fix build on 32bit

• Remove unnecessary libs from USE_GL and add required.
• Fix build on 32bit ARCHS, upstream issue:

https://github.com/PixarAnimationStudios/OpenSubdiv/issues/1198#issuecomment-2143940211

• Make options OPENMP (for supported ARCHS) and PTEX default.
• EXAMPLES and OPENCL can build together without errors.
• Remove NO_GL_TESTS - upstream removed it.
• Sort options and pet portclippy.

PR: 279472
Approved by: Shane <FreeBSD@ShaneWare.Biz> (maintainer)