If do_patch re-executes, patching the configure script will fail because
it will have been regenerated during do_configure. We're patching
configure.ac so we don't need to patch configure anyway.
(From OE-Core rev: ae98a95577ba9c8a6a0d9a78d4cea33a92adff35)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>