[Varnish] #1277: missing build dep

[Varnish]

#1277: missing build dep
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 Reporter:  perbu   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  trunk
 Severity:  major   |   Keywords:
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 The current master branch wont build without libedit. The failure happens
 in varnishadm and it's quite hard to defer what actually is going on.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1277>
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