Improve XEmacs compatibility.

Improve XEmacs compatibility.

* net/tramp.el (tramp-replace-environment-variables): Make it a defun.

* net/tramp-adb.el (top): Require `time-date'.
(tramp-adb-ls-output-time-less-p): Use `tramp-time-less-p'.
(tramp-adb-handle-copy-file, tramp-adb-handle-rename-file): Use
`tramp-file-name-handler'.
(tramp-adb-maybe-open-connection): Use
`tramp-compat-set-process-query-on-exit-flag'.

* net/tramp-sh.el (tramp-sh-handle-file-acl): Use
`tramp-compat-funcall'.

* net/tramp-smb.el (tramp-smb-handle-file-acl): Use `looking-at' and
`tramp-compat-funcall'.