[MacPorts] #54546: lftp needs to have aclocal run pre-configure, or else it fails to build on Sierra

[MacPorts]

#54546: lftp needs to have aclocal run pre-configure, or else it fails to build on
Sierra
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 Reporter:  vjorlikowski  |      Owner:
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:
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 lftp is breaking prior to configure being run on Sierra, thanks to a
 automake version mis-match.

 The attached diff fixes the issue.

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Ticket URL: <https://trac.macports.org/ticket/54546>
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