support symlink on NTFS

check-symlink.patch

diff -r 536aa8b0c934 -r d6b9170d0b1c src/os_win32.c
--- a/src/os_win32.c	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/os_win32.c	Tue Aug 21 22:36:45 2012 +0900
@@ -2718,6 +2718,12 @@
 mch_is_linked(char_u *fname)
 {
     BY_HANDLE_FILE_INFORMATION info;
+    int perm;
+
+    perm = mch_getperm(fname);
+    if (perm != -1 && !(perm & FILE_ATTRIBUTE_DIRECTORY)
+				    && (perm & FILE_ATTRIBUTE_REPARSE_POINT))
+	return TRUE;
 
     return win32_fileinfo(fname, &info) == FILEINFO_OK
 						   && info.nNumberOfLinks > 1;