[MacPorts] #41154: openscad: fix build with libc++

[MacPorts]

#41154: openscad: fix build with libc++
------------------------------+-------------------------------
 Reporter:  ecronin@…         |      Owner:  macsforever2000@…
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.2.1
 Keywords:  mavericks libc++  |       Port:  openscad
------------------------------+-------------------------------
 The guard in {{{src/stl-utils.cc}}} assumes that {{{defined(__APPLE__) &&
 defined(__GNUC__)}}} means g++ and libstdc++.  To be correct it should be
 checking for a libstdc++ #define (or the lack of a libc++ #define).

 The quick macports fix is on Mavericks (and earlier when configure.stdlib
 is libc++) patch that file to make the guard false.  I'm not sure what the
 boilerplate we're using for libc++ checks is, and don't have time to look
 this morning, so no patch provided.  CCing Jeremy since he's taken on a
 lot of the libc++ work in case he has time.

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Ticket URL: <https://trac.macports.org/ticket/41154>
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