Use `file-name-concat' in Tramp

Use `file-name-concat' in Tramp

* lisp/net/tramp-compat.el (tramp-compat-file-name-concat):
New defalias.

* lisp/net/tramp.el (tramp-handle-expand-file-name):
* lisp/net/tramp-adb.el
(tramp-adb-handle-directory-files-and-attributes):
* lisp/net/tramp-gvfs.el (tramp-gvfs-handle-expand-file-name):
* lisp/net/tramp-sh.el (tramp-sh-handle-expand-file-name):
* lisp/net/tramp-smb.el (tramp-smb-handle-expand-file-name):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-handle-expand-file-name):
Use it.