[MacPorts] #53805: ghostscript @9.19: update to 9.21

[MacPorts]

#53805: ghostscript @9.19: update to 9.21
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  Reporter:  l2dy         |      Owner:  MarcusCalhoun-Lopez
      Type:  update       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:
      Port:  ghostscript  |
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Comment (by ryandesign):

 This changed the install_name of libgs.dylib, so all ports that link to
 that library need to be revbumped. Before you do that, you need to fix it
 so that libgs.dylib gets the correct install_name again (with the full
 path to the library); see #54019.

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Ticket URL: <https://trac.macports.org/ticket/53805#comment:3>
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