[MacPorts] #48145: castxml: add variants for different versions of clang toolchain, use corresponding toolchain for compilation

[MacPorts]

#48145: castxml: add variants for different versions of clang toolchain, use
corresponding toolchain for compilation
----------------------+------------------------
 Reporter:  mmoll@…   |      Owner:  stromnov@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:  haspatch  |       Port:  castxml
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 castxml needs to be compiled with clang 3.6 or higher. It also needs the
 full install of llvm that MacPorts provides (Xcode is not complete
 enough). The attached patch fixes compilation problems on older OSs and
 adds the option to use clang-3.7.

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Ticket URL: <https://trac.macports.org/ticket/48145>
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