[MacPorts] #61635: calc-2.12.6.8 errors calling __builtin___memmove_chk when building with Big Sur/Xcode 12.2

[MacPorts]

#61635: calc-2.12.6.8 errors calling __builtin___memmove_chk when building with Big
Sur/Xcode 12.2
----------------------+--------------------
 Reporter:  leuliett  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.6.4
 Keywords:  Big Sur   |       Port:
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 The function declarations for memmove and __builtin___memmove_chk in
 alloc.h aren't compatible with the include files with Xcode12.2/BigSure:
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include/secure/

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Ticket URL: <https://trac.macports.org/ticket/61635>
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