Updating graphics/graphviz from 2.22.2 to 2.24.0

pkgsrc changes:
  - Adding support for ghostscript
  - Removing option for swig - it's used automatically now when a
    language binding is choosen
  - Removing rsvg and guile from suggested options to reduce default
    dependencies

Upstream changes:
June 16, 2009
        - Release 2.24.0
        - Core:
                - add new layout engine for large graphs: sfdp
        - Fixed bugs:
                1515, 1590, 1598, 1601, 1605, 1607, 1609, 1610, 1611,
                1614, 1615, 1617, 1625, 1628, 1634, 1635, 1640, 1641,
                1642, 1646, 1649, 1651, 1652

(sno)