bug#56963: 29.0.50; trampified make-empty-file on macOS

[dick.r.chiang@gmail.com]

Someone with a mac might try `make test/lisp/net/tramp-tests`
to verify the new tramp-test10-write-region (21afc26) works
as well as it does on linux.

I get this consistently in a macOS 11.6.8 cloud env I've no
control over:

Test tramp-test10-write-region condition:
    (ert-test-failed
     ((should
       (string-equal
	(buffer-string)
	""))
      :form
      (string-equal "-n \n" "")
      :value nil :explanation
      (arrays-of-different-length 4 0 "-n \n" "" first-mismatch-at 0)))



In Commercial Emacs 0.3.1snapshot 2f899ba in dev (upstream 29.0.50, x86_64-pc-linux-gnu) built on dick
Repository revision: 2f899bac86a9d6ca94db931da9407a7f35745b8a
Repository branch: dev
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04.4 LTS

Configured using:
 'configure WERROR_CFLAGS=-Werror --prefix=/home/dick/.local
 --with-tree-sitter CC=gcc-10
 PKG_CONFIG_PATH=/home/dick/.local/lib/pkgconfig CXX=gcc-10'
Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
TREE_SITTER LCMS2 LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM
XINPUT2 XPM GTK3 ZLIB
Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Magit Rev

Minor modes in effect:
  goto-address-mode: t
  global-git-commit-mode: t
  shell-dirtrack-mode: t
  bug-reference-mode: t
  projectile-mode: t
  flx-ido-mode: t
  override-global-mode: t
  global-hl-line-mode: t
  hl-line-mode: t
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  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Features:
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telega-folders telega-inline telega-tdlib telega-server telega-core
telega-customize cursor-sensor vc-hg vc-bzr vc-src vc-sccs vc-cvs vc-rcs
log-view elpaso elpaso-admin elpaso-milky elpaso-defs emms-source-file
locate dos-w32 find-cmd gnus-html ag vc-svn find-dired goto-addr
magit-extras mule-util gravatar dns face-remap magit-patch-changelog
magit-patch magit-submodule magit-obsolete magit-blame magit-stash
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magit-remote magit-commit magit-sequence magit-notes magit-worktree
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pcvs-util add-log magit-core magit-margin magit-transient magit-process
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ob-tangle org-src ob-ref ob-lob ob-table ob-exp ob-comint ob-core
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move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 2609419 243763)
 (symbols 48 58503 0)
 (strings 32 302230 64066)
 (string-bytes 1 9419838)
 (vectors 16 155597)
 (vector-slots 8 3736428 266246)
 (floats 8 1618 2343)
 (intervals 56 372748 3853)
 (buffers 1000 65))