'RELENG_5_3_0_RELEASE'.

This commit was manufactured to restore the state of the 5.3-RELEASE image.

per letter dated July 22, 1999.

Approved by: core, imp

#include <strings.h>
...
  foo = (char *)strdup(...);
To:
#include <string.h>
  foo = strdup(...);
because the former segfaults on an ia64 since there is no prototype
for strdup() in strings.h.  Converting an "int" to a pointer is fatal.

o remove main prototype

Obtained from:	OpenBSD

Manpage formatting/grammatical fixes.
Check return value of malloc()
Add sccsid[], other minor source code cleanups

Submitted by:	Philippe Charnier