https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224236
Changes besides the version update:
- Added missing USEx clauses
- Added the EXAMPLES option
- Changed the package name to OpenSceneGraph for readability, also because their webpage lists it this way (http://www.openscenegraph.org/), and because DISTVERSIONPREFIX and examples directory use it this way.
Bumping PORTREVISION of 5 depending ports.
I verified that OSG works with simple test programs.