[PATCH v2] NEWS: Mention changes to setjmp on aarch64

[Wilco Dijkstra]

Hi Yury,
 
+* On AArch64 Linux targets supporting SME, setjmp and sigsetjmp will
+  disable ZA state of SME.
+

LGTM.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

Cheers,
Wilco