graphics/graphviz: Fix build with ghostscript-9.07.
graphics/graphviz: Fix build with ghostscript-9.07.

This reverts commit 15ea2056fdf008b653c02f27ddf2e416cd34ac1b.

Signed-off-by: David Spencer <56ea053749afdfbb925029291d22523c9549dc08@slackbuilds.org>

panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds