[newlib-cygwin] syscalls.cc: Fix num_links

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=17ede0eae5d3973bbe10298d5bde223a5bdfdb97

commit 17ede0eae5d3973bbe10298d5bde223a5bdfdb97
Author: Ben Wijen <ben@wijen.net>
Date:   Fri Jan 15 14:45:26 2021 +0100

    syscalls.cc: Fix num_links
    
    NtQueryInformationFile on fh_ro needs FILE_READ_ATTRIBUTES
    to succeed.

Diff:
---
 winsup/cygwin/syscalls.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 525efecf3..3030f6fff 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -755,8 +755,9 @@ _unlink_nt (path_conv &pc, bool shareable)
       if ((pc.fs_flags () & FILE_SUPPORTS_TRANSACTIONS))
 	start_transaction (old_trans, trans);
 retry_open:
-      status = NtOpenFile (&fh_ro, FILE_WRITE_ATTRIBUTES, &attr, &io,
-			   FILE_SHARE_VALID_FLAGS, flags);
+      status = NtOpenFile (&fh_ro,
+                           FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES,
+                           &attr, &io, FILE_SHARE_VALID_FLAGS, flags);
       if (NT_SUCCESS (status))
 	{
 	  debug_printf ("Opening %S for removing R/O succeeded",