x-own-selection has been renamed to x-set-selection, and the order
of its arguments has been reversed, for consistency with other
lisp functions like put and aset.
* term/x-win.el (x-select-text): Adjusted.
(x-cut-buffer-or-selection-value): Check the primary selection,
using x-selection, instead of checking the cut buffer again.
* term/x-win.el: Doc fix.