[MacPorts] #40642: vigra: build crashes clang 3.3

[MacPorts]

#40642: vigra: build crashes clang 3.3
--------------------------+-------------------------------
 Reporter:  ryandesign@…  |      Owner:  benjamin.seppke@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.2.0
 Keywords:                |       Port:  vigra
--------------------------+-------------------------------
 See this build log:

 https://build.macports.org/builders/buildports-snowleopard-
 x86_64/builds/21090/steps/compile/logs/stdio

 Not sure whose bug this is.

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Ticket URL: <https://trac.macports.org/ticket/40642>
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