[MacPorts] #39033: gtkimageview: fix compiling with -Werror by default

[MacPorts]

#39033: gtkimageview: fix compiling with -Werror by default
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  Reporter:  ionic@…       |      Owner:  devans@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:  haspatch
      Port:  gtkimageview  |
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Comment (by ionic@…):

 Reporting upstream doesn't really work, as upstream is not accepting new
 bug reports via trac, cf. http://bjourne.webfactional.com/

 I sent the developer a mail, but don't expect a lot, as the project hasn't
 seen updates for three years.

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Ticket URL: <https://trac.macports.org/ticket/39033#comment:4>
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