attr: attr_2.4.47 release tarball missing configure.ac

attr: attr_2.4.47 release tarball missing configure.ac

The release tarball of attr 2.4.47 is missing the configure.ac file.
This prevents the autotools bbclass from being able to regenerate the
configure script which leads to other side affects. (e.g. using
outdated config.sub)

This patch adds the configure.ac file via a patch.
(obtained via the source repository at the v2.4.47 tag)

See the mailing list thread for additional information:
http://lists.nongnu.org/archive/html/acl-devel/2013-05/msg00024.html

(From OE-Core rev: b28f12a272a9e2f0c3084a58b91605acb05f58f8)

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>