Update xscreensaver to 4.01.

Changes since 4.00:
* New hacks: `twang', `glsnake', `boxed', `sballs', and `glforestfire'.
* New hacks `apollonian', `euler2d', `juggle', `polyominoes' and
  `thornbird', from xlockmore.
* Merged recent xlockmore changes into `ant', `braid', `demon',
  `discrete', `drift', `fadeplot', `forest', `grav', `hopalong',
  `ifs', `laser', `lightning', `lisa', `lissie', `loop', `mountain',
  `penrose', `rotor', `sierpinski', `slip', `sphere', `spiral',
  `strange', and `vines'.
* Fixed the `gltext' bug that sometimes caused horizontal lines to
  vanish again.  This time for sure.
* Sped up `webcollage' by adding a C helper program to replace the PPM
  pipeline.  It also pastes images semi-transparently now.
* Added support for the gdk_pixbuf library: if this lib is available,
  then `blitspin', `xflame', and `flag' can load GIF, JPEG, and PNG
  images in addition to XPM and XBM. [not enabled in pkg]
* Fixed a rare race condition where the desktop-grabbing hacks could
  sometimes leave the screen wedged, if the user moved the mouse
  exactly when they were grabbing the screen image (it would un-wedge
  the next time the saver timed out or was activated.)
* Fixed incorrect colors in the screen-grabbing GL hacks (`gflux' and
  `flipscreen3d'.)
* Made SIGHUP restart the daemon process (though using
  `xscreensaver-command -restart' is still the preferred way.)
* Tweaks to `xspirograph'.
* Minor configure and portability tweaks.

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