Add -f(no-)error-spans flag to hash-irrelevant flags

This flag is used by the default build-command in `haskell-mode` so
it's very noticeable if haskell-mode causes to recompile the world

NB: no changelog entry as this can be considered a follow-up to #5589

(cherry picked from commit 50be57e)

Cabal/Distribution/Simple/Program/GHC.hs

@@ -170,7 +170,8 @@ normaliseGhcArgs (Just ghcVersion) PackageDescription{..} ghcArgs
             [ [ "reverse-errors", "warn-unused-binds", "break-on-error"
               , "break-on-exception", "print-bind-result"
               , "print-bind-contents", "print-evld-with-show"
-              , "implicit-import-qualified" ]
+              , "implicit-import-qualified", "error-spans"
+              ]
             , from [8,2]
                 [ "diagnostics-show-caret", "local-ghci-history"
                 , "show-warning-groups", "hide-source-paths"