Test suite build failure: Duplicate instance declaration NFData Ordering

[Dan Burton]

Build failure with GHC 8.2.1 as seen on the Stackage build server

Building test suite 'extras' for unicode-transforms-0.3.2..
[1 of 2] Compiling QuickCheckUtils  ( test/QuickCheckUtils.hs, dist/build/extras/extras-tmp/QuickCheckUtils.o )

test/QuickCheckUtils.hs:11:10: error:
    Duplicate instance declarations:
      instance NFData Ordering
        -- Defined at test/QuickCheckUtils.hs:11:10
      instance [safe] NFData Ordering -- Defined in ‘Control.DeepSeq’
   |
11 | instance NFData Ordering where
   |          ^^^^^^^^^^^^^^^