[GHC] #14534: Split T12971 into its own Makefile

[GHC]

#14534: Split T12971 into its own Makefile
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  low            |         Milestone:  8.6.1
          Component:  Test Suite     |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 `testsuite/tests/driver/Makefile` includes the `T12971` target. This
 (intentionally) has non-ASCII characters in it. As a result, any change to
 that makefile will trigger a lint error. We should give that test its own
 makefile to isolate it a bit.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14534>
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