Use stack setup so you can ignore most of the output

A workaround for https://github.com/commercialhaskell/stack/issues/1212

appveyor.yml

@@ -13,6 +13,7 @@ environment:
     STACK_ROOT: "c:\\sr"
 
 test_script:
+- stack setup > nul
 # The ugly echo "" hack is to avoid complaints about 0 being an invalid file
 # descriptor
-- echo "" | stack --arch i386 --no-terminal --install-ghc test
+- echo "" | stack --no-terminal test