[UPDATE] games/linux-q3ademo: clean-up, minor fixes, rename to
* Rename to "linux-quake3-demo" (also rename port directory).
* Add SIZE entry to distinfo.
* Fix symlink with different OpenGL implementations (ports).
* Take maintainership.
* Use SUB_FILES for script.
* Distfile is fetched automatically from MASTER_SITE_GENTOO.
Submitted by: Alejandro Pulver <email@example.com>