[MacPorts] #71474: Build failure on macOS 15 (wrong `CMAKE_OSX_SYSROOT`)

[MacPorts]

#71474: Build failure on macOS 15 (wrong `CMAKE_OSX_SYSROOT`)
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 Reporter:  emmyoh  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  soxr
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 Build fails on macOS 15 as it expects a `CMAKE_OSX_SYSROOT` of
 `/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk`. My machine is an
 M1 MacBook Air from 2020.
 Log file is attached.

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Ticket URL: <https://trac.macports.org/ticket/71474>
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