MFH: r395047 (security relevant change only)

• Apply fix for CVE-2015-3228, denial of service via crafted Postscript files.

The security relevant change was applied manually as r395047 split the
Ghostscript ports into separate X11-independent and -dependent parts.

PR: 202781
Security: CVE-2015-3228
Security: fc1f6658-4f53-11e5-934b-002590263bf5
Approved by: ports-secteam (feld), feld,delphij (mentors)