Rely on {send,recv}_fd in the fd-send-recv package

We need to remove the stubs to avoid linking errors in projects
which are using both this transitional package and the new fd-send-recv one.

We re-export the functions from here so no client code changes
are required.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Update OASIS autogenerated files

Signed-off-by: David Scott <dave.scott@eu.citrix.com>