[MacPorts] #70702: Provide a compatibility wrapper for scandir in legacy-support

[MacPorts]

#70702: Provide a compatibility wrapper for scandir in legacy-support
-------------------------+----------------------------
 Reporter:  fhgwright    |      Owner:  fhgwright
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  legacy-support
-------------------------+----------------------------
 The signature for `scandir()` changed between the 10.7 and 10.8 SDKs,
 causing a pointer-type mismatch in some builds.  This is usually just a
 warning, but `gcc14` started treating this as an error by default, causing
 broken builds.

 The fix should consist of creating a wrapper function to "launder" the
 argument type, and then optionally defining `scandir` as a macro expanding
 to the wrapper.  This can't be done unconditionally, since that could
 break anything that assumes the default behavior.

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Ticket URL: <https://trac.macports.org/ticket/70702>
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