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

[MacPorts]

#39033: Fix gtkimageview compiling with -Werror by default
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 Reporter:  ionic@…     |      Owner:  macports-tickets@…
     Type:  submission  |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.3
 Keywords:              |       Port:  gtkimageview
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 Currently usage of -Werror is forced by the configure script, no matter
 what the user decides to set via the --enable-compile-warnings toggle. Fix
 that.

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