FileIO.h: removed wrong function declaration

Author: Federico Fissore

hardware/arduino/avr/libraries/Bridge/FileIO.h

@@ -46,7 +46,6 @@ class File : public Stream {
   operator bool();
   const char * name();
   boolean isDirectory();
-  boolean iFileSystemirectory(void);
   File openNextFile(uint8_t mode = FILE_READ);
   void rewindDirectory(void);