[MacPorts] #65630: GraphicsMagick: disable SIGSEGV handler in library; add debug variant

[MacPorts]

#65630: GraphicsMagick: disable SIGSEGV handler in library; add debug variant
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  Reporter:  mascguy         |      Owner:  mascguy
      Type:  enhancement     |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.7.2
Resolution:                  |   Keywords:  debug
      Port:  GraphicsMagick  |
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Comment (by ryandesign):

 Replying to [ticket:65630 mascguy]:
 > Relative to the signal handler, we should consider patching the code to
 disable that, for the library. Along with engaging with upstream, for a
 longer-term fix.

 Yes, please [https://sourceforge.net/p/graphicsmagick/bugs/ consult with
 upstream] before attempting that.

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Ticket URL: <https://trac.macports.org/ticket/65630#comment:6>
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