delete guileslop and add haskellslop

examples/hs/plain-ghc/Hello.hs

@@ -0,0 +1,15 @@
+module Main where
+
+import Foreign (Int32)
+
+
+foreign export ccall "hello" hello :: IO Int32
+
+hello :: IO Int32
+hello = do
+  putStrLn "hello from Haskell!!!"
+  pure 0
+
+main :: IO ()
+main = error "defining main shouldn't be necessary since we set -no-hs-main, \
+             \but HLS is yelling at me and i just want to calm her down."