[MacPorts] #49876: giflib: update to 5.1.4

[MacPorts]

#49876: giflib: update to 5.1.4
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  Reporter:  jakepetroules  |      Owner:  ryandesign
      Type:  update         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  giflib         |
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Comment (by ryandesign):

 A [https://github.com/macports/macports-
 ports/pull/3751#issuecomment-524127934 PR was submitted] but it was
 incomplete and closed for lack of activity.

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Ticket URL: <https://trac.macports.org/ticket/49876#comment:3>
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