update lpd(8) when you update libc

[itojun%iijlab.net@localhost]

>Modified Files:
>       basesrc/lib/libc/net: rcmd.c
>       basesrc/usr.sbin/lpr/lpd: extern.h lpd.c
>Log Message:
>(rcmd.c) to make Zoularis happier, pass sa_len separately from sockaddrs.
>this changes function prototype for __ivalid*.
>This commit breaks binary compatibility for __ivalid*.  I believe this can be
>forgiven due to the following:
>- this is not really exported function.  no function prototype is in headers.
>  function name starts with underbars.  No third-party applications are
>  expected to use it.
>- the function was introduced very recently, when rcmd.c was made IPv6-ready.
>- the only customer in NetBSD tree is lpd.
>(lpd.c) sync with rcmd.c change.

        Sorry for the mess, please be sure to recompile lpd, when you update
        libc next time.

itojun