[MacPorts] #56015: llvm-gcc42: Don't build with -Werror

[MacPorts]

#56015: llvm-gcc42: Don't build with -Werror
------------------------+------------------------
 Reporter:  ryandesign  |      Owner:  jeremyhu
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  llvm-gcc42
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 Parts of llvm-gcc42 build with `-Werror`. This can cause the build to fail
 if a newer compiler is used which includes warnings that were not
 anticipated when llvm-gcc42 was written.

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Ticket URL: <https://trac.macports.org/ticket/56015>
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