moving x-select* [was Re: [Emacs-diffs] /srv/bzr/emacs/trunk r102057: Make all 3 copies of x-select-enable-clipboard have the same doc.]

[Glenn Morris]

>>> So how about finding a better home for that stuff? Like frame.el or
>>> mouse.el, for example?
[...]
> Fine by me, yes.  I just want to get rid of the duplication.

Is it OK to move x-select-enable-clipboard and x-select-text from
common-win and pc-win to select.el? I am a little unsure since the
condition for loading select.el in loadup is the presence of
mouse-support, a condition which is not present in the current *-win
files.