Fix and silence warnings in example files

We fixed a warning in example files, because they will
likely to be removed once we have a final version on API.

Instead it would be possible to check documentation and `tools`
executables sources to see a full featured examples of use.

Author: qnikst

scls-format/examples/extract-by-ns/Main.hs

@@ -4,13 +4,13 @@
 -- it will generate files "{namespace}.data"
 -- for each namespace it sees
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# OPTIONS_GHC -fno-warn-incomplete-uni-patterns #-} -- this is a tempororary file
 module Main
   where
 
 import Data.Function (fix)
 import Data.Char
 import qualified Data.Text as T
-import System.FilePath
 import qualified Data.ByteString as BS
 import Cardano.SCLS.Internal.Frame
 import Cardano.SCLS.Internal.Block.Chunk

scls-format/examples/read-file/Main.hs

@@ -2,12 +2,12 @@
 --
 -- TODO: use some streaming library instead of the current approach?
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# OPTIONS_GHC -fno-warn-incomplete-uni-patterns #-} -- this is a tempororary file
 module Main
   where
 
 import System.IO
 import Data.Function (fix)
-import Data.Foldable (for_)
 import Cardano.SCLS.Internal.Frame
 import System.Environment (getArgs)
 import Cardano.SCLS.Internal.Block.Hdr