* Work around a bizarre bug that causes nvidia-settings to be able to

  find libXrandr when invoked as "nvidia-settings", but not when
  invoked by absolute path
  (e.g. "/var/run/current-system/sw/bin/nvidia-settings").  Adding it
  to libGL's RUNPATH fixes this.  Strangely, libGL doesn't even
  contain a reference to libXrandr.

svn path=/nixpkgs/trunk/; revision=15971