installing graphviz adds gtk2 package
`apk add graphviz` adds gtk2.0+,
should only get installed when graphviz-gtk is added.
(from redmine: issue id 2279, created on 2013-10-12, closed on 2013-11-19)
- Changesets:
- Revision be04756f by Natanael Copa on 2013-10-16T15:26:29Z:
main/graphviz: move rsvg plugin to -gtk subpackage
ref #2279