[MacPorts] #37553: gmt4 update to 4.5.9

[MacPorts]

#37553: gmt4 update to 4.5.9
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 Reporter:  florian@…  |      Owner:  macports-tickets@…
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  gmt4
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 This update obsoletes #34066 and requires #34065.

 The old shoreline package (GSHHS) needed for ports gmt4 and gmt5 has been
 renamed to GSHHG and is now stand-alone and not provided with GMT anymore.
 GMT expects GSHHG to be available separately during build time and hence
 depends on the macport gshhg-gmt-nc4 (#34065).

 Note: I supply two patches for Portfile: the first for white space changes
 and the other for the main changes.

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Ticket URL: <https://trac.macports.org/ticket/37553>
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