x11/xscreensaver PLIST needs a patch

[Mayuresh <mayuresh%acm.org@localhost>]

I just disabled opengl option when building xscreensaver to find several
PLIST errors as follows:

1. Since PLIST.opengl is separate, I guess opengl specific files don't
need to be in main PLIST.

2. Further, the following files present in PLIST were not found to be
in the install area. They are not in PLIST.opengl either.

libexec/xscreensaver/cityflow
libexec/xscreensaver/config/cityflow.xml
libexec/xscreensaver/config/cubestack.xml
libexec/xscreensaver/config/cubetwist.xml
libexec/xscreensaver/config/discoball.xml
libexec/xscreensaver/config/dymaxionmap.xml
libexec/xscreensaver/config/energystream.xml
libexec/xscreensaver/config/geodesic.xml
libexec/xscreensaver/config/geodesicgears.xml
libexec/xscreensaver/config/hexstrut.xml
libexec/xscreensaver/config/hydrostat.xml
libexec/xscreensaver/config/projectiveplane.xml
libexec/xscreensaver/config/raverhoop.xml
libexec/xscreensaver/config/romanboy.xml
libexec/xscreensaver/config/splitflap.xml
libexec/xscreensaver/config/splodesic.xml
libexec/xscreensaver/config/unicrud.xml
libexec/xscreensaver/config/vigilance.xml
libexec/xscreensaver/config/winduprobot.xml
libexec/xscreensaver/cubestack
libexec/xscreensaver/cubetwist
libexec/xscreensaver/discoball
libexec/xscreensaver/dymaxionmap
libexec/xscreensaver/energystream
libexec/xscreensaver/geodesic
libexec/xscreensaver/geodesicgears
libexec/xscreensaver/hexstrut
libexec/xscreensaver/hydrostat
libexec/xscreensaver/projectiveplane
libexec/xscreensaver/raverhoop
libexec/xscreensaver/romanboy
libexec/xscreensaver/splitflap
libexec/xscreensaver/splodesic
libexec/xscreensaver/unicrud
libexec/xscreensaver/vigilance
libexec/xscreensaver/winduprobot
man/man6/cityflow.6
man/man6/cubestack.6
man/man6/cubetwist.6
man/man6/discoball.6
man/man6/dymaxionmap.6
man/man6/energystream.6
man/man6/geodesic.6
man/man6/geodesicgears.6
man/man6/hexstrut.6
man/man6/hydrostat.6
man/man6/projectiveplane.6
man/man6/raverhoop.6
man/man6/romanboy.6
man/man6/splitflap.6
man/man6/splodesic.6
man/man6/unicrud.6
man/man6/vigilance.6
man/man6/winduprobot.6


It builds fine for -opengl, after removing both bunches of files from
PLIST.


Please review and amend PLIST suitably.

Mayuresh