Update to libspiff-1.0.0.  BUILDLINK_API_DEPENDS.libspiff is now
set to 1.0.0.

2008-09-21 -- 1.0.0

  * Improved: XSPF writing API re-designed
  * Added: Customizable malicious XML detection, off by default
  * Fixed: Deep-copy broken in SpiffTrack and SpiffProps
  * Fixed: Strip example working again
  * Fixed: Some Code::Blocks files missing in release archives
  * Fixed: Documentation fixes
  * Added: Virtual hook to hopefully save a few ABI breaks
      in the future
  * Improved: Now shipping gnulib's config.guess from HEAD
  * Changed: No longer exposing these classes:
      - SpiffDataWriter
      - SpiffTrackWriter
      - SpiffPropsWriter
      - SpiffSkipExtensionReader
      - SpiffStrictReaderCallback
  * Changed: No longer bundling Expat and uriparser
  * Soname: 4:0:0

(bjs)