BIND 10 #2236: Add a --enable-debug configure flag

[BIND 10 Development]

#2236: Add a --enable-debug configure flag
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            Reporter:  vorner        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  Unclassified  |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Add a --enable-debug configure switch. The purpose is to turn on some
 debugging utilities that are too expensive for deployment but may help
 development or finding problems.

 One of such thighs is enabling/disabling PTHREAD_MUTEX_ERRORCHECK and
 PTHREAD_MUTEX_ROBUST in src/lib/util/threads/lock.cc from #2202. Currently
 it unconditionally enables such checks, which might be needlessly slow.

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Ticket URL: <http://bind10.isc.org/ticket/2236>
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