GF.Main: leave the code page unchanged on Windows

This should make it easier to use GF with UTF-8 in the Windows Console
See https://groups.google.com/forum/#!topic/gf-dev/DCou6FDhCnU

src/compiler/GF/Main.hs

@@ -23,7 +23,7 @@ import GF.System.Console (setConsoleEncoding)
 -- Run @gf --help@ for usage info.
 main :: IO ()
 main = do
-  setConsoleEncoding
+  --setConsoleEncoding
   uncurry mainOpts =<< getOptions
 
 -- | Get and parse GF command line arguments. Fix relative paths.