[GHC] #12223: Get rid of extra_files.py

[GHC]

#12223: Get rid of extra_files.py
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           Reporter:  ezyang         |             Owner:  thomie
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Test Suite     |           Version:  8.0.1
           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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 Hello thomie! When you refactored the test suite you added
 `testsuite/driver/extra_files.py` to record what extra files need to get
 copied. In it, there is a comment "Maybe move this information to .T files
 at some point."  This ticket is to remind you so you don't forget. This
 file is *extremely* un-discoverable.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12223>
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