Patch for broken 'cabal configure --enable-tests'

[Thomas Tuegel]

When we fixed dependency resolution for tests in cabal-install, I
didn't make 'cabal configure' add the new resolver constraints when
appropriate. As a result, 'cabal configure' was silently ignoring
'--enable-tests' and '--enable-benchmarks'. The attached patch
corrects this behavior.

Thanks!

-- 
Thomas Tuegel
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