[MacPorts] #37810: Update zeroc-ice33 to build with clang

[MacPorts]

#37810: Update zeroc-ice33 to build with clang
------------------------+-------------------------
 Reporter:  jeremyhu@…  |      Owner:  blair@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.2
 Keywords:              |       Port:  zeroc-ice33
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 zeroc-ice33 currently blacklist clang.  Please remove the blacklisting by
 fixing the project:

 http://www.zeroc.com/forums/patches/5647-patch-compiling-ice-clang-
 gcc4-7-a.html

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Ticket URL: <https://trac.macports.org/ticket/37810>
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