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

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

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

Approved by: re (implicit)

Since I'm having so much fun with const, beat my head against the wall
some more. Make this compile cleanly.

returned length can exceed the limits of type char

Submitted by: blc@bsdwins.com
Approved by: gad
MFC after: 1 week

Add many prototypes and ANSI-ize 'patch. Not a complete job of it, but it gets
our patch to look a little more like NetBSD's, and has the nice characteristic
that the object code is exactly the same after the change as before it (even in
patch.c and pch.c, which have pesky 'assert' statements in them).

Reviewed by: /sbin/md5 on i386, alpha, sparc64
MFC after: 3 days

Add FreeBSD id's to these files, in advance of a separate update.

MFC after: 3 days

Resurrect patch 2.1 without FreeBSD Index: hack