Add the patch that fixes i686 Darwin build.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

libffi/ChangeLog:

	* LOCAL_PATCHES: Add patch to fix i686 darwin build.

Add

commit a91f844e
Author: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Date:   Mon Nov 15 10:24:27 2021 +0100

    libffi: Use #define instead of .macro in  src/x86/win64.S [PR102874]

to LOCAL_PATCHES.

	* LOCAL_PATCHES: Add commit a91f844e.

Add

commit 90205f67
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date:   Mon Oct 25 23:29:26 2021 +0000

    rs6000: Fix bootstrap (libffi)

    This fixes bootstrap for the current problems building libffi.

to LOCAL_PATCHES.

	* LOCAL_PATCHES: Add commit 90454a90.

	* LOCAL_PATCHES: New file.