WinCE: don't strip leading slash when converting from file:// URIs

file:// URI syntax on Windows features a leading slash before the drive
letter (file:///C:/Foobar/...). This is irrelevant on WinCE, that only
has a root directory.
(cherry picked from commit c4402537)

src/input/input.c

@@ -2362,7 +2362,7 @@ static int InputSourceInit( input_thread_t *p_input,
             *p = '\0';
         /* Then URI-decode the path. */
         decode_URI( psz_path );
-#ifdef WIN32
+#if defined( WIN32 ) && !defined( UNDER_CE )
         /* Strip leading slash in front of the drive letter */
         psz_path++;
 #endif