user/nettle: (ppc64) possible SIGILL on pre-POWER8 systems
The 3.9
release fixes some issues in 3.8
that may affect pre-POWER8 systems.
See also:
- https://lists.gnu.org/archive/html/info-gnu/2023-05/msg00007.html
- https://github.com/gnutls/nettle/commits/master
- 9b3cf580
Miscellaneous ppc64 improvements as well.