BIND 10 #3318: Add builder that uses -ftrapv flag on g++

[BIND 10 Development]

#3318: Add builder that uses -ftrapv flag on g++
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                   Reporter:  shane  |                 Owner:  jreed
                       Type:  task   |                Status:  new
                   Priority:         |             Milestone:  New Tasks
  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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 We recently updated the code to not depend on behavior of signed integer
 overflow in ticket #3010.

 We do not set the -ftrapv flag which revealed this problem because there
 is a runtime cost.

 However, we should run our tests in an environment to insure that we don't
 add any code that violates this constraint. This ticket is to set up such
 a builder.

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Ticket URL: <https://bind10.isc.org/ticket/3318>
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