[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 mascguy):

 Since apps now have control over signal handler registration, we can take
 that off of our plate.

 As for the debug variant: Based on local testing, the `debug` portgroup
 does the trick for this port. Are there any concerns/gotchas with
 utilizing that?

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Ticket URL: <https://trac.macports.org/ticket/65630#comment:8>
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