* net/tramp.el (tramp-make-temp-file): Move to tramp-compat.el.

* net/tramp.el (tramp-make-temp-file): Move to tramp-compat.el.
(tramp-do-copy-or-rename-file-directly): Handle tmpfile only in
the cond clauses where needed.
(tramp-handle-write-region): Rearrange code for proper handling of
tmpfile.

* net/tramp-compat.el (tramp-compat-make-temp-file): New defsubst.

* net/tramp.el:
* net/tramp-fish.el:
* net/tramp-ftp.el:
* net/tramp-smb.el: Rename `tramp-make-temp-file' to
`tramp-compat-make-temp-file'.