[MacPorts] #61876: libicns fails build in MacOS 11.1

[MacPorts]

#61876: libicns fails build in MacOS 11.1
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 Reporter:  SpikeLightfoot  |      Owner:  (none)
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:  MacPorts 2.7.0
Component:  ports           |    Version:  2.6.4
 Keywords:                  |       Port:
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 ...
 :info:build png2icns.c:328:4: error: implicit declaration of function
 'unlink' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
 ...

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Ticket URL: <https://trac.macports.org/ticket/61876>
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