include/vlc_fs.h: Windows: use _wrewinddir instead of rewinddir

vlc_scandir() uses vlc_loaddir() whichs calls rewinddir. Under Windows this
results in a segmentation fault.

include/vlc_fs.h

@@ -46,6 +46,15 @@ VLC_EXPORT( int, vlc_rename, ( const char *oldpath, const char *newpath ) );
 
 #if defined( WIN32 ) && !defined( UNDER_CE )
 # define stat _stati64
+
+static inline void vlc_rewinddir( DIR *dir )
+{
+    _WDIR *wdir = *(_WDIR **)dir;
+
+    _wrewinddir( wdir );
+}
+# undef rewinddir
+# define rewinddir vlc_rewinddir
 #endif
 
 VLC_EXPORT( int, vlc_stat, ( const char *filename, struct stat *buf ) );