[MacPorts] #57994: OpenBLAS compilation fails on MacBook Pro MacOS 10.14

[MacPorts]

#57994: OpenBLAS compilation fails on MacBook Pro MacOS 10.14
-------------------------+-------------------------
  Reporter:  Tim-at-AST  |      Owner:  NicosPavlov
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:
      Port:  OpenBLAS    |
-------------------------+-------------------------

Comment (by kencu):

 So now the linker finds libSystem, but can't uderstand it
 {{{
 :info:build ld: unexpected token: !tapi-tbd-v3 file
 '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd'
 for architecture x86_64
 }}}
 The linker looks wrong. It should understand that tbd file. Please report
 back the result of:
 {{{
 port -v installed | grep ld64
 }}}
 to see what linker we're dealing with here...

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Ticket URL: <https://trac.macports.org/ticket/57994#comment:14>
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