[MacPorts] #65945: jemalloc fails on 10.5.8: Undefined symbols: _malloc_default_purgeable_zone, __Unwind_Resume using a modified MacPorts setup on 10.5 that is defaulting to use gcc11

[MacPorts]

#65945: jemalloc fails on 10.5.8: Undefined symbols:
_malloc_default_purgeable_zone, __Unwind_Resume using a modified MacPorts
setup on 10.5 that is defaulting to use gcc11
---------------------------+-------------------------------------------
  Reporter:  barracuda156  |      Owner:  kencu
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  powerpc, leopard, snowleopard
      Port:  jemalloc      |
---------------------------+-------------------------------------------

Comment (by barracuda156):

 And this fails too on 10.5.8:
 {{{
 :info:build include/jemalloc/internal/jemalloc_internal_inlines_a.h: In
 function 'malloc_cpuid_t malloc_getcpu()':
 :info:build include/jemalloc/internal/jemalloc_internal_inlines_a.h:16:32:
 error: 'sched_getcpu' was not declared in this scope
 :info:build    16 |         return (malloc_cpuid_t)sched_getcpu();
 :info:build       |                                ^~~~~~~~~~~~
 }}}

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Ticket URL: <https://trac.macports.org/ticket/65945#comment:22>
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