bug#25895: Remove update-game-score

[Paul Eggert]

Eli Zaretskii wrote:

> Please add comments to the affected Makefile.in files to explain the
> conditions related to user/group.

Done in the attached revised patch, which also fixes the bug Ulrich Müller 
noted.

> I also don't understand why you unconditionally removed this program
> from the Windows builds and installations: the problem with setgid
> doesn't exist on Windows, so nothing should prevent Windows
> installations from having this program, right?

It's more the other way round. On platforms without setuid/setgid, Emacs can use 
its already-existing code to update the score file itself. The auxiliary program 
is needed only on platforms that have setuid/setgid, to avoid the security 
problems that would ensue if we made Emacs itself setuid/setgid.

0001-Install-update-game-score-only-on-request.patch
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