Merge pull request #1028 from bubba/unit-test-speedup

Fix unit tests clogging CircleCI builds

Author: alanz

haskell-ide-engine.cabal

@@ -181,8 +181,9 @@ test-suite unit-test
                      , ghc-mod-core
                      , hslogger
                      , yaml
-
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N -Wall -Wredundant-constraints
+  -- don't multithread i.e. --with-rtsopts=-N
+  -- otherwise ghc-mod operations become super slow on CircleCI
+  ghc-options:         -Wall -Wredundant-constraints
   if flag(pedantic)
      ghc-options:      -Werror
   default-language:    Haskell2010