[MacPorts] #42728: autogen @5.17.4_0: autoopts-config produces a stray -R flag, breaks gnutls @3.1.22_0 build

[MacPorts]

#42728: autogen @5.17.4_0: autoopts-config produces a stray -R flag, breaks gnutls
@3.1.22_0 build
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  Reporter:  jwhowse4@…      |      Owner:  mww@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.2.1
Resolution:                  |   Keywords:
      Port:  autogen gnutls  |
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Comment (by mschamschula@…):

 I just built gnutls 3.3.3 without the autogen under Mavericks 10.9.3. I
 also noticed a missing dependency from my non-MacPorts systems: unbound.
 Please test the attached Portfile patch on Lion and Mountain Lion (I don't
 have access to MacPorts systems with these OSs).

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Ticket URL: <https://trac.macports.org/ticket/42728#comment:21>
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