sync: some files from upstream

* build-aux/config.guess: This.
* build-aux/config.sub: And this.
* build-aux/gendocs.sh: And this.
* build-aux/gnupload: And this.
* build-aux/texinfo.tex: And this.
* doc/standards.texi: And this.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>
6 files changed