xsfbs.sh: kill {,de}register_x_lib_dir_with_ld_so

libx11's postinst was the only post-sarge user, and it's gone now.

debian/xsfbs/xsfbs.sh

@@ -719,72 +719,6 @@ run () {
   fi
 }
 
-register_x_lib_dir_with_ld_so () {
-  # syntax: register_x_lib_dir_with_ld_so
-  #
-  # Configure the dynamic loader ld.so to search /usr/X11R6/lib for shared
-  # libraries.
-  #
-  # Call this function from the postinst script of a package that places a
-  # shared library in /usr/X11R6/lib, before invoking ldconfig.
-
-  local dir ldsoconf
-
-  dir="/usr/X11R6/lib"
-  ldsoconf="/etc/ld.so.conf"
-
-  # is the line not already present?
-  if ! fgrep -qsx "$dir" "$ldsoconf"; then
-    observe "adding $dir directory to $ldsoconf"
-    echo "$dir" >> "$ldsoconf"
-  fi
-}
-
-deregister_x_lib_dir_with_ld_so () {
-  # syntax: deregister_x_lib_dir_with_ld_so
-  #
-  # Configure dynamic loader ld.so to not search /usr/X11R6/lib for shared
-  # libraries, if and only if no shared libaries remain there.
-  #
-  # Call this function from the postrm script of a package that places a shared
-  # library in /usr/X11R6/lib, in the event "$1" is "remove", and before
-  # invoking ldconfig.
-
-  local dir ldsoconf fgrep_status cmp_status
-
-  dir="/usr/X11R6/lib"
-  ldsoconf="/etc/ld.so.conf"
-
-  # is the line present?
-  if fgrep -qsx "$dir" "$ldsoconf"; then
-    # are there any shared objects in the directory?
-    if [ "$(echo "$dir"/lib*.so.*.*)" = "$dir/lib*.so.*.*" ]; then
-      # glob expansion produced nothing, so no shared libraries are present
-      observe "removing $dir directory from $ldsoconf"
-      # rewrite the file (very carefully)
-      set +e
-      fgrep -svx "$dir" "$ldsoconf" > "$ldsoconf.dpkg-tmp"
-      fgrep_status=$?
-      set -e
-      case $fgrep_status in
-        0|1) ;; # we don't actually care if any lines matched or not
-        *) die "error reading \"$ldsoconf\"; fgrep exited with status" \
-          "$fgrep_status" ;;
-      esac
-      set +e
-      cmp -s "$ldsoconf.dpkg-tmp" "$ldsoconf"
-      cmp_status=$?
-      set -e
-      case $cmp_status in
-        0) rm "$ldsoconf.dpkg-tmp" ;; # files are identical
-        1) mv "$ldsoconf.dpkg-tmp" "$ldsoconf" ;; # files differ
-        *) die "error comparing \"$ldsoconf.dpkg-tmp\" to \"$ldsoconf\";" \
-          "cmp exited with status $cmp_status" ;;
-      esac
-    fi
-  fi
-}
-
 make_symlink_sane () {
   # syntax: make_symlink_sane symlink target
   #