bug#41463: 27.0.91; ACL error on Windows when trying to save file

[Lars Ljung <lars@matholka.se>]

I get the following error when trying to save a specific file:

Saving file h:/some/file.txt...
file-extended-attributes: Getting ACLs: Input/output error, h:/some/file.txt

This is unexpected since both Emacs 26.3 and notepad.exe are able to
write to this file. Even though I also get an error when using the
Get-Acl command in PowerShell.

In GNU Emacs 27.0.91 (build 2, x86_64-w64-mingw32)
Repository revision: 4b9fbdb5a713745dfdb13042e33ba2345e6860e1
Repository branch: emacs-27
Windowing system distributor 'Microsoft Corp.', version 10.0.18363
System Description: Microsoft Windows 10 Enterprise (v10.0.1909.18363.836)

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --prefix=/c/emacs/emacs-27.1 --without-compress-install
 --disable-build-details --without-pop LDFLAGS=-shared-libgcc'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS NOTIFY W32NOTIFY ACL GNUTLS
LIBXML2 HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER
LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t