Adjust version check to unbreak the build of 304.xx branch.

Reported by:	Walter Schwarzenfeld
Mark legacy branches -173, -96, and -71 as FORBIDDEN: they are unsupported
by NVidia and no security updates for them were issued to fix CVE-2014-8298.

Security:	fdf72a0e-8371-11e4-bc20-001636d274f3
- Remove support for EXTRACT_PRESERVE_OWNERSHIP
- Update a few comments related to extract

Differential Revision:	https://reviews.freebsd.org/D1189
With hat:	portmgr
- Separate TeX style files from math/gnuplot into math/gnuplot-tex-extras
  to eliminate huge TeXLive dependency.  Note that TeX terminal support is
  still enabled by default because it works without them.

- Add Lua dependency to support TeX/Tikz terminal.

Approved by:	glewis (maintainer)