[GHC] #16264: Install reqlib'd libraries during CI

[GHC]

#16264: Install reqlib'd libraries during CI
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           Reporter:  bgamari        |             Owner:  bgamari
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Continuous     |           Version:  8.6.3
  Integration                        |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently tests requiring external libraries are hardly ever run. We
 likely don't want to run them in every job but we should have at least one
 job that makes a point of doing so.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16264>
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