dev-perl/Tk-CursorControl: Undo my removal of demos

dev-perl/Tk-CursorControl: Undo my removal of demos

The demos with the Tk system are a bit quirky, and you can't really
handle them the same way we typically handle examples in Gentoo.

These demos have to be installed in a location that the "widget" program
that ships with Tk can find and load, and it has special spice to make
it work.

There may be a compromise of some kind, but it requires the ability to
gut the demo system from Tk itself, which is far more work than we have
time for, and the added complexity with handling that with USE and USE
dependencies just isn't worth it.

Bug: https://rt.cpan.org/Ticket/Display.html?id=124794
Package-Manager: Portage-2.3.66, Repoman-2.3.16
Signed-off-by: Kent Fredric <kentnl@gentoo.org>