[MacPorts] #63744: zstd: link failure on 10.4 PPC: common symbols not allowed with MH_DYLIB output format with the -multi_module option

[MacPorts]

#63744: zstd: link failure on 10.4 PPC: common symbols not allowed with MH_DYLIB
output format with the -multi_module option
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  zstd     |
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Comment (by jmroot):

 TBH the preferable solution is to compile with `-fno-common` and fix the
 code to work that way. That's the default with newer compilers, few people
 understand what common linkage does, and it's very rare that you actually
 need it.

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Ticket URL: <https://trac.macports.org/ticket/63744#comment:2>
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