[MacPorts] #49324: ghostscript @9.16_1: update to 9.18

[MacPorts]

#49324: ghostscript @9.16_1: update to 9.18
----------------------------+--------------------------------
 Reporter:  mschamschula@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.3.4
 Keywords:  haspatch        |       Port:  ghostscript
----------------------------+--------------------------------
 ghostscript has been updated to version 9.18.

 Note 1: this update fixes one issue (patch-base_stdpre.h.diff no longer
 needed as an upstream ifdef effectively replaces the patch), while
 introducing a new issue: a new header file gserrors.h is included in
 ierrors.h, but not installed causing the gimp2 build to fail.

 Note 2: at the very least gimp2 needs a revision bump, as it directly
 links to libgs.

-- 
Ticket URL: <https://trac.macports.org/ticket/49324>
MacPorts <https://www.macports.org/>
Ports system for OS X