BIND 10 #3067: Detect if elinks exists before trying to use it to generate docs

[BIND 10 Development]

#3067: Detect if elinks exists before trying to use it to generate docs
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                   Reporter:  muks   |                 Owner:  UnAssigned
                       Type:         |                Status:  new
  defect                             |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:  build  |             Sensitive:  0
  system                             |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Currently, `configure` does not detect if `elinks` exists before trying to
 use it to generate docs. `elinks` program has to be detected as a
 dependency (similar to `xsltproc`) as it's not installed by default on
 many systems.

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Ticket URL: <http://bind10.isc.org/ticket/3067>
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