package/freeipmi: bump to version 1.6.16

Removes the patches since they are all integrated upstream.

Release notes:
https://lists.gnu.org/archive/html/freeipmi-announce/2025-01/msg00000.html
https://lists.gnu.org/archive/html/freeipmi-announce/2025-09/msg00000.html



Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>