MFC r314653:

libexec: normalize paths using SRCTOP-relative paths or :H when possible

This simplifies make logic/output

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Consistently set RPCGEN_CPP when running rpcgen, so the C preprocessor
set via ${CPP} is used, instead of always using hardcoded /usr/bin/cpp.

MFC after: 1 week

Make WARNS=6 the default for libexec/.

Just like bin/ and sbin/, I think setting WARNS to the highest value
possible will make it more attractive for people to fix warnings.

- The WARNS variable is set in the Makefile in the directory of the
application itself, making it more likely that it will be removed out
of curiosity to see what happens.
- New applications will most likely build with WARNS=6 out of the box,
because the author would more likely fix the warnings during
development than lower WARNS.

Unfortunately almost all apps in libexec require a lowered value of
WARNS.

Lock down with WFORMAT?=1, with overrides in the subdirectories which
are not yet warning-clean. Tested on i386 and alpha.

- Backout botched attempt to intoduce MANSECT feature.
- MAN[1-9] -> MAN.

Set the default manual section for libexec/ to 8.

$Id$ -> $FreeBSD$

Fixed missing dependencies on headers generated by rpcgen, as usual.
Removed bogus dependencies of generated .c files on generated headers.
Sorted sources lists.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Fixed DPADD.

Take ypxfrd_xdr.c out of SRCS line. It should be included in librpcsvc,
which ypxfr links with. (Sorry: left over development bogon.)

Just a reminder: you must rebuild librpcsvc before you build
this program.

Pointed out by: Stephen Hocking

Add support for rpc.ypxfrd and document it in the man page.

Also generallize the yp_dbwrite functions a little: allow the caller
to specify certain flags. I need this mostly for some changes to
rpc.yppasswdd to allow in-place updates.

Also change Makefile a little to use the same format as ypserv.

This commit was generated by cvs2svn to compensate for changes in r13007,
which included commits to RCS files with non-trunk default branches.

Import the new ypxfr, written by yours truly. Functionally equivalent
to the old one, except that it supports an additional option (-p path)
that lets you specify the top level path wiere your NIS maps live.
(ypserv allows you to specify a path like this, so it makes sense that
ypxfr should too. ypserv will automagically pass the -p flag to ypxfr
if you use a path other than /var/yp when you start it.)

This program uses client stub code generated by rpcgen as well as
the yp_dblookup.c module from ypserv.