libffi supports ARC since commit 34c2afeb75 ("libffi: back-port support
for ARC") in 2014.
Add nds32 and ARMv7-M to the list.
Cc: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>