[MacPorts] #68610: kealib: update the port

[MacPorts]

#68610: kealib: update the port
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 Reporter:  barracuda156  |      Owner:  Veence
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  kealib
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 `kealib` upstream moved to GitHub, the current version is 1.5.2:
 https://github.com/ubarsc/kealib

 P. S. I have some linking errors at the moment:
 https://github.com/ubarsc/kealib/issues/42 (possibly, powerpc-specific).

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Ticket URL: <https://trac.macports.org/ticket/68610>
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