[MacPorts] #69571: Add stpncpy to legacy support

[MacPorts]

#69571: Add stpncpy to legacy support
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 Reporter:  ryandesign   |      Owner:  mascguy
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  legacy-support
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Ticket URL: <https://trac.macports.org/ticket/69571>
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