[MacPorts] #70130: zstdConfig.cmake uses Linux flags on some macOS which breaks configure

[MacPorts]

#70130: zstdConfig.cmake uses Linux flags on some macOS which breaks configure
-------------------------------+---------------------------------
  Reporter:  barracuda156      |      Owner:  MarcusCalhoun-Lopez
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.9.3
Resolution:                    |   Keywords:
      Port:  zstdConfig.cmake  |
-------------------------------+---------------------------------

Comment (by barracuda156):

 Replying to [comment:1 ryandesign]:
 > Replying to [ticket:70130 barracuda156]:
 > > Problem is that CMake uses Linux-specific linker flags,
 >
 > Which flag is Linux-specific?

 The linker does not see `-z noexecstack` as a linker flag at all, which is
 why we an error:
 {{{
 powerpc-apple-darwin10-gcc-4.2.1: noexecstack: No such file or directory
 }}}

 Of course pthreads are supported, but this flags breaks it.

-- 
Ticket URL: <https://trac.macports.org/ticket/70130#comment:2>
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