[MacPorts] #37813: Update libpcl to build with clang

[MacPorts]

#37813: Update libpcl to build with clang
------------------------+---------------------
 Reporter:  jeremyhu@…  |      Owner:  vince@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.2
 Keywords:              |       Port:  libpcl
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 libpcl is currently whitelisting llvm-gcc, but that's not a long term
 viable solution.  Please work with upstream to get this port building with
 clang or file tickets with llvm.org or Apple to resolve bugs in the
 compiler if there are any which is preventing this.

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Ticket URL: <https://trac.macports.org/ticket/37813>
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