[MacPorts] #43932: portconfigure.tcl: add macports-clang-3.4 to the list of fallback compilers

[MacPorts]

#43932: portconfigure.tcl: add macports-clang-3.4 to the list of fallback compilers
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  Reporter:  mojca@…      |      Owner:  jmr@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.3.0
Resolution:               |   Keywords:
      Port:               |
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Changes (by jeremyhu@…):

 * owner:  macports-tickets@… => jmr@…


Comment:

 We should cherry pick r120637 as well.

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Ticket URL: <https://trac.macports.org/ticket/43932#comment:2>
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