[MacPorts] #65414: elftoolchain does not build on ARM64

[MacPorts]

#65414: elftoolchain does not build on ARM64
---------------------------+----------------------
  Reporter:  ostefano      |      Owner:  raimue
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  arm64
      Port:  elftoolchain  |
---------------------------+----------------------

Comment (by ryandesign):

 The error in the log is:

 {{{
 elf.c:34:18: error: use of undeclared identifier 'LIBELF_ARCH'
         .libelf_arch            = LIBELF_ARCH,
                                   ^
 elf.c:35:22: error: use of undeclared identifier 'LIBELF_BYTEORDER'
         .libelf_byteorder       = LIBELF_BYTEORDER,
                                   ^
 elf.c:36:19: error: use of undeclared identifier 'LIBELF_CLASS'
         .libelf_class           = LIBELF_CLASS,
                                   ^
 3 errors generated.
 *** [elf.po] Error code 1
 }}}

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Ticket URL: <https://trac.macports.org/ticket/65414#comment:2>
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