Revert "Make file globbing work on windows."

This reverts commit 363ecfebc3.

pandoc.cabal

@@ -301,7 +301,6 @@ Library
      other-modules: Text.Pandoc.Data
   if os(windows)
     Cpp-options:      -D_WINDOWS
-    Build-depends:  Glob >= 0.7 && < 0.8
   Ghc-Options:   -rtsopts -Wall -fno-warn-unused-do-bind
   Ghc-Prof-Options: -fprof-auto-exported -rtsopts
   Default-Language: Haskell98

pandoc.hs

@@ -73,9 +73,6 @@ import Text.Pandoc.Readers.Txt2Tags (getT2TMeta)
 import Paths_pandoc (getDataDir)
 import Text.Printf (printf)
 import Text.Pandoc.Error
-#ifdef _WINDOWS
-import System.FilePath.Glob (glob)
-#endif
 
 type Transform = Pandoc -> Pandoc
 
@@ -1059,13 +1056,7 @@ main = do
 
   -- thread option data structure through all supplied option actions
   opts <- foldl (>>=) (return defaultOpts) actions
-
--- on windows we need to do our own file globbing, since the shell doesn't.
-#ifdef _WINDOWS
-  mapM glob args >>= convertWithOpts opts . concat
-#else
   convertWithOpts opts args
-#endif
 
 convertWithOpts :: Opt -> [FilePath] -> IO ()
 convertWithOpts opts args = do