The weak alias macros can only work before namespace.h gets included because
when the strings get expanded we gain an _ from namespace.h. So define a
macro to point to the appropriate include file fo

The weak alias macros can only work before namespace.h gets included because
when the strings get expanded we gain an _ from namespace.h. So define a
macro to point to the appropriate include file for the hash function, and
include the hash function later, from the .c file we always include. This
allows us to eliminate the hack of including namespace.h twice as well as
nbtool_config.h.

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Add missing __RCSID()

Overhaul how `build.sh tools' are used:

* Rename "config.h" to "nbtool_config.h" and
HAVE_CONFIG_H to HAVE_NBTOOL_CONFIG_H.
This makes in more obvious in the source when we're using
tools/com

Overhaul how `build.sh tools' are used:

* Rename "config.h" to "nbtool_config.h" and
HAVE_CONFIG_H to HAVE_NBTOOL_CONFIG_H.
This makes in more obvious in the source when we're using
tools/compat/config.h versus "standard autoconf" config.h

* Consistently move the inclusion of nbtool_config.h to before
<sys/cdefs.h> so that the former can provide __RCSID() (et al),
and there's no need to protect those macros any more.

These changes should make it easier to "tool-ify" a program by adding:
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
to the top of the source files (for the general case).

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netbsd.org->NetBSD.org

Add the md[245], sha1 and rmd160 functions to libnbcompat, conditional on their
not being in the host libc.
This will be necessary to make cksum into a host tool.

Need internal names for MD[45]{Init,Final,Update}().

- Liberal application of suggestions in /usr/share/misc/style.
- Don't use sed(1) to generate these files. The C preprocessor
is your friend.