Log Message:
Update print/ghostscript-esp{,-nox11} to ESP Ghostscript 8.15.1.  This
version is based on the GPL Ghostscript 8.15 release.  Major changes from
Ghostscript 7.0x include:

* Many printer drivers were added and updated.
* Improved support for running as a job server (-dJOBSERVER)
* Support for DeviceN colorspaces at up to 8 colorants total at 8 bits
  per colorant.
* The PDF writer has been considerably improved and implements PDF
  1.4 encryption
* Add a new feature to scale PDFs to the current page size.
* Font rendering has been substantially reworked and improved.
* PDF 1.4 transparency rendering is much more likely to be correct
* Improved support for CID font substitution.
* Improved processing of incorrect and broken PDF files, including files
  with corrupted xref tables and non-ASCII font names.
* Support for JBIG2-encoded images.
* The usual plethora of bug fixes.