Add the character " to the list of badCharacters in Windows file names

It really is invalid on Windows. Trying to write a file containing
this chacacter give an invalid argument exception.

System/FilePath/Internal.hs

@@ -714,7 +714,7 @@ normaliseDrive drive = if isJust $ readDriveLetter x2
 -- information for validity functions on Windows
 -- see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/naming_a_file.asp
 badCharacters :: [Char]
-badCharacters = ":*?><|"
+badCharacters = ":*?><|\""
 badElements :: [FilePath]
 badElements = ["CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9", "CLOCK$"]