Remove hlint as default HaskellTool

Hlint is usually used once in a pipeline, not per-job or per architecture/platform. Thus, we only need one hlint image.

It can easily be installed in an x86_64 image:

curl -sSL https://raw.github.com/ndmitchell/hlint/master/misc/run.sh | sh -s .

This might also fix image build issues.

components/HaskellTools.dhall

@@ -23,14 +23,13 @@ let
           --enable-static \
           --install-method=copy \
           --installdir=${binDir} \
-          hscolour happy alex hlint-3.3
+          hscolour happy alex
         ''
       ]
     # CF.env (toMap
       { HAPPY = "${binDir}/happy"
       , ALEX = "${binDir}/alex"
       , HSCOLOUR = "${binDir}/HsColour"
-      , HLINT = "${binDir}/hlint"
       })
 
 in