In move mode, always first try to rename. Before, upon failure to

In move mode, always first try to rename.  Before, upon failure to
rename a directory, this code would never attempt to rename any
other file in that directory, but would thenceforth always copy.
On some systems (NetApp version ??), renaming a directory may fail
with EXDEV, yet renaming files within that directory to a newly-
created destination directory succeeds.

(copy_internal): Remove local, move_mode;
use x->move_mode instead.  Based on a patch from Tom Haynes.