I posted these patches in May 2023 at the same time as I posted patches
for the kernel to connect to an abstract address.
The kernel patches landed and I forgot to follow-up with these.
Thanks Petr for the reminder.
NeilBrown
[PATCH 1/3] Allow working with abstract AF_UNIX addresses.
[PATCH 2/3] Change local_rpcb() to take a targaddr pointer.
[PATCH 3/3] Try using a new abstract address when connecting rpcbind