[MacPorts] #73167: libgcc15 can't find "md-unwind-def.h" (10.5.8)

[MacPorts]

#73167: libgcc15 can't find "md-unwind-def.h" (10.5.8)
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  Reporter:  nbuwe     |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.11.5
Resolution:            |   Keywords:  powerpc leopard
      Port:  libgcc15  |
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Comment (by ballapete):

 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123976 has at its end three
 commitments to make the code of coming GCC 16 work in single threaded
 single CPUs – that's the problem! The code to build the compiler has
 optimisations for multi-threaded/multi-core CPU that passes to build the
 three symlinks to a not existing CPU or thread. This only happens with
 make's default j=1, making it a rather PowerPC specific problem.

 Could be the patches also work for building GCC 15.2.

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Ticket URL: <https://trac.macports.org/ticket/73167#comment:9>
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