KNF nit: opening brace of a function on next line.

basename_r and dirname_r are non-standard and different from what we define
here on FreeBSD. Their libgen.h exposes them unconditionally, so hide ours
for now.

Factor out the basename and dirname code into basename_r and dirname_r
which are static for now. Inspired by similar changes to android(bionic).

guard single-dot from modification by the application
(SUSv3 spec don't forbid this brutal operation).
this idea taken from OpenBSD's version of basename(3) and dirname(3).

undo the constification of the argument. Per opengroup.

Remove clause 3 and 4 from TNF licenses

constify dirname(3) and basename(3)

Change basename(3) and dirname(3) to return a pointer to static
storage, rather than modifying their input arguments. While not
reentrant, this is explcitly allowed by IEEE Std 1003.1-2001 (which
al

Change basename(3) and dirname(3) to return a pointer to static
storage, rather than modifying their input arguments. While not
reentrant, this is explcitly allowed by IEEE Std 1003.1-2001 (which
allows either behavior, stating that it is implementation-dependent).

The new semantics are considered less hostile/more useful by most programs
which use basename(3) and/or dirname(3) (several programs in the NetBSD
tree reimplement basename()/dirname() themselves to avoid modification
of the input argument).

This new implementation truncates results to PATH_MAX. The Std does
not address this in the static storage case. However since PATH_MAX
is the maximum pathname length in the Std, this should not be a problem
in practice. Nontheless, it is noted in the BUGS section.

See the basename(3)/dirname(3) regression tests in src/regress/lib/libc.

Inspired by discussion with Niels Provos, related to PR 18647.

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Roll in fixes to permit cross-compiling from non-NetBSD hosts. This
round has been tested on Solaris/x86 and Linux hosts.

* Add host tools cap_mkdb, ctags, m4, uudecode.
* Protect __RCSID() and __C

Roll in fixes to permit cross-compiling from non-NetBSD hosts. This
round has been tested on Solaris/x86 and Linux hosts.

* Add host tools cap_mkdb, ctags, m4, uudecode.
* Protect __RCSID() and __COPYRIGHT() better.
* Reduce the number of places that need to include "config.h", to keep
sources closer to their "vanilla" versions.
* Add more compat #defines and autoconf-checked functions.

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Add hooks for reachover builds from src/tools/compat.

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

Add basename() and dirname(), from XPG4.2.