[MacPorts] #52354: links @2.12_1 update to 2.13 and fix dependencies / add variants

[MacPorts]

#52354: links @2.12_1 update to 2.13 and fix dependencies / add variants
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 Reporter:  leonardo.schenkel@…  |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:                       |       Port:  links
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 I have upgrade Links to 2.13 and I have improved the Portfile. The
 previous versions had problems of opportunistic linking and requiring
 `libjpeg` and `libpng` even if graphics support was disabled. I have added
 two additional variants for TIFF and SVG support.

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Ticket URL: <https://trac.macports.org/ticket/52354>
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