Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC r231118:

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add each directory's symbol map file to SYM_MAPS.

libc_r wasn't so tied to libc for 22 months.

$Id$ -> $FreeBSD$

Fixed the usual missing dependencies on headers generated by rpcgen.

Use rpcgen's -C option, although using it for non-headers breaks K&R
support. A local copy of yp.h is built to avoid adding
-I/usr/include/rpcsvc to CFLAGS. This version of yp.h differed from
<rpcsvc/yp.h> only in not declaring prototypes.

Fixed style bugs.

Use ${DESTDIR} correctly in front of absolute paths.

Changed all paths to be relative to src/lib instead of src/lib/libc
so that all these makefiles can be used to build libc_r too.

Added .if ${LIB} == "c" tests to restrict man page builds to libc
to avoid needlessly building them with libc_r too.

Split libc Makefile into Makefile and Makefile.inc to allow the
libc_r Makefile to include Makefile.inc too.

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.

Now that rpcgen is squared away, arrange to have all the NIS XDR routines
rpcgen-erated on the fly (just like librpcsvc).

Makefile: Add rule for generating yp_xdr.c and yp.h.

xdryp.c: gut everything except the special ypresp_all XDR function
needed to to handle yp_all() (this one can't be created on
the fly), and xdr_datum(), which isn't used internally by
libc, but which as documented as being there in yp_prot.h,
so what the hell. We now get everything else from yp_xdr.c.

yplib.c: change a few structure member names to match those found in
yp.h instead of those declared in yp_prot.h.

Add back in the YP code from 1.1.5. (This attribution brought to you
by Theo de Raadt.) Added a new make flag variable, NO_YP_LIBC, which
disables YP entirely. User-land programs to come later.