There is an updated pull request by ndowens against master on the void-packages repository

https://github.com/ndowens/void-packages tirpc
https://github.com/void-linux/void-packages/pull/17782

libtirpc: update to 1.2.5
Also add a -musl-devel subpackage since
musl does not have a native rpc, which
will cause no conflict. Also doing this will
make packaging easier instead
of adding CFLAGS=-I/usr/include/tirpc
when packaging software for musl that depends on it

Signed-off-by: Nathan Owens <ndowens04@gmail.com>

A patch file from https://github.com/void-linux/void-packages/pull/17782.patch is attached