[MacPorts] #53784: Add support for tapi-tbd-v2 (was: clang-3.7 fail)

[MacPorts]

#53784: Add support for tapi-tbd-v2
--------------------------+----------------------
  Reporter:  jtalle       |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ld64-latest  |
--------------------------+----------------------
Changes (by jeremyhu):

 * port:  clang-3.7 => ld64-latest


Comment:

 > :info:build ld: unexpected token: !tapi-tbd-v2 file
 '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/lib/libc++abi.tbd'
 for architecture x86_64

 Please use the +ld64-latest variant of ld64.

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Ticket URL: <https://trac.macports.org/ticket/53784#comment:3>
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