ports/90245: Update mesa-demos ports to version 6.4.1

[Volker Stolz]

Synopsis: Update mesa-demos ports to version 6.4.1

State-Changed-From-To: open->feedback
State-Changed-By: vs
State-Changed-When: Mon Dec 12 13:58:36 UTC 2005
State-Changed-Why: 
The web-interface mangled the tabs to spaces in the patch.
Could you please resubmit in a way that doesn't alter the patch,
preferably send-pr?

http://www.freebsd.org/cgi/query-pr.cgi?pr=90245