autoconf: remove automake patch enforcing --foreign

autoconf: remove automake patch enforcing --foreign

Since 2004 we've been carrying a patch[1] make autoreconf pass --foreign to
automake.  Presumably at the time this was due to many upstreams using
hand-coded bootstrap scripts that passed --foreign manually, but we were using
autoreconf.  These days many projects have added foreign to AM_INIT_AUTOMAKE and
use autoreconf directly, so this patch isn't as critical as it used to be.

(From OE-Core rev: 74b05bba64589da0e4439a4293559ad9670104bd)

Signed-off-by: Ross Burton <ross.burton@intel.com>
[1] oe-classic 2ab2a92eadaf2f80410d8746099f8a9b1b81ff91
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>