[MacPorts] #73953: giflib5: install under libexec

[MacPorts]

#73953: giflib5: install under libexec
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 Reporter:  mohd-akram  |      Owner:  Schamschula
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  giflib5
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 The current file hierarchy is very non-standard. It would be better to
 install the full tree under ${prefix}/libexec/giflib5 as we do with other
 ports.

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Ticket URL: <https://trac.macports.org/ticket/73953>
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