[MacPorts] #51520: llvm-3.9 @3.9-r270400_0+assertions+debug build failure on snow leopard due to missing strnlen function - and fix

[MacPorts]

#51520: llvm-3.9 @3.9-r270400_0+assertions+debug build failure on snow leopard due
to missing strnlen function - and fix
-------------------------------------+-------------------------
  Reporter:  kenneth.f.cunningham@…  |      Owner:  jeremyhu@…
      Type:  defect                  |     Status:  new
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.3.4
Resolution:                          |   Keywords:  snowleopard
      Port:  llvm-3.9                |
-------------------------------------+-------------------------

Comment (by jeremyhu@…):

 The issue also impacts older BSDs and other operating systems.  While it
 has been around for a while, this function was only added to POSIX in
 SUSv4.

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Ticket URL: <https://trac.macports.org/ticket/51520#comment:5>
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