ghostscript: 9.22 -> 9.24 (security)
ghostscript: 9.22 -> 9.24 (security)

The $doc stuff needed changes, probably because of ghostscript newly
reacting to some configure flags that stdenv passes.
 - share/ghostscript/9.22/doc was an ugly location for documentation,
   and I didn't like their new share/ghostscript/9.24 either,
   so that got changed to share/doc/ghostscript/9.24
 - their process no longer installs examples, apparently,
   but I don't expect that would be any problem for us

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