Allow being compiled as a tool.

Update old-style definitions to ANSI, remove a couple of register
definitions along the way. Fixed gcc 4.1 build (thank you vax)

There are two instances of getsubopt.c, one in gen, which came by the
ways of 386BSD, and one in stdlib, which is from Lite-2. The former was
picked up by the build process and has seen a little mor

There are two instances of getsubopt.c, one in gen, which came by the
ways of 386BSD, and one in stdlib, which is from Lite-2. The former was
picked up by the build process and has seen a little more maintenance
while the latter's location is "right", so bring the latter up to par
with the former and dispose of the (now) latter.

Reported by David A. Holland in PR lib/25160, which is worded in a
far less mind-boggling fashion than the above.

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Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

back out the #ifdef _DIAGNOSTIC argument checks; too many people complained.
_DIAGASSERT() is still retained.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attemp

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

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remove obsolete register declarations

Pull in <string.h> to get strcmp() prototype.

RCS ID police, and add explicit return value to getsubopt().

import lite-2