BIND 10 #1440: help string for —with-botan should be more helpful

[BIND 10 Development]

#1440: help string for —with-botan should be more helpful
-------------------------------------+-------------------------------------
            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  critical      |                       Status:  new
           Component:  build system  |                    Milestone:  Next-
           Sensitive:  0             |  Sprint-Proposed
         Sub-Project:  Core          |                     Keywords:
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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 It currently reads:
 {{{
   --with-botan=PATH       specify exact directory of Botan library
 }}}

 While this switch is actually used to look for ${cv_value}/bin/botan-
 config

 That's confusing and indeed confused a user:
 https://lists.isc.org/pipermail/bind10-users/2011-November/000104.html

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Ticket URL: <http://bind10.isc.org/ticket/1440>
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