gnupload: moved to gnulib

gnupload: moved to gnulib

Since the gnupload script is not required by automake-generated
code (be it configure or Makefile content), and is not specifically
tied to automake in any way, it is better to have its master copy
installed in the gnulib repository, as is already done for similar
generally-useful, maintainer-oriented scripts.  We can them sync it
from there.

See also gnulib commit v0.0-6822-gf8b7120, and:
<http://lists.gnu.org/archive/html/bug-gnulib/2012-01/msg00222.html>

* Makefile.am (FETCHFILES): Added 'gnupload'.
(fetch): Also sync 'gnupload' from the gnulib repository.
* lib/gnupload: Synced from gnulib.
* NEWS: Update.