package/libffi: bump to version 3.4.3
Update hash of license file (year updated with
https://github.com/libffi/libffi/commit/41d0851fc545ff1ffd8377236d193268c8a10740)
https://github.com/libffi/libffi/releases/tag/v3.4.3
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>