nfs-utils: add host package

nfs-utils: add host package

We only need the host package for the rpcgen utility. glibc deprecated
this utility in version 2.26. Fedora has recently removed rpcgen from
its glibc package. So we need to build the rpcgen from the nfs-utils
package.

The removal of Sun RPC from glibc also removed RPC headers from glibc.
rpcgen needs two of these headers. Add host-libtirpc to provide the RPC
headers.

Tested-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>