resolve/remove USAGE_LICENSE macros; remove repetitive (c) strings

This takes another small step towards disentangling the build
system from the old AT&T environment. The USAGE_LICENSE macros with
author and copyright information, which was formerly generated
dynamically for each file from a database, are eliminated and the
copyright/author information is instead inserted into the AST
getopt usage strings directly.

Repetitive license/copyright information is also removed from the
getopt strings in the builtin commands (src/lib/libcmd/*.c and
src/cmd/ksh93/data/builtins.c). There's no need to include 55
identical license/copyright strings in the ksh binary; one (in the
main ksh getopt string, shown by ksh --man) ought to be enough!
This makes the ksh binary about 10k smaller.

It does mean that something like 'enum --author', 'typeset
--license' or 'shift --copyright' will now not show those notices
for those builtins, but I doubt anyone will care.

src/cmd/ksh93/sh/nvtype.c

@@ -29,7 +29,7 @@
 
 static const char sh_opttype[] =
 "[-1c?\n@(#)$Id: type (AT&T Labs Research) 2008-07-01 $\n]"
-USAGE_LICENSE
+"[--catalog?" SH_DICT "]"
 "[+NAME?\f?\f - set the type of variables to \b\f?\f\b]"
 "[+DESCRIPTION?\b\f?\f\b sets the type on each of the variables specified "
 	"by \aname\a to \b\f?\f\b. If \b=\b\avalue\a is specified, "

src/cmd/ksh93/sh/shcomp.c

@@ -29,9 +29,12 @@
 #include "version.h"
 
 static const char usage[] =
-"[-?\n@(#)$Id: shcomp (AT&T Research/ksh93) " SH_RELEASE " $\n]"
-USAGE_LICENSE
+"[-?\n@(#)$Id: shcomp (AT&T Research) " SH_RELEASE " $\n]"
+"[-author?David Korn <dgk@research.att.com>]"
+"[-copyright?(c) 1982-2012 AT&T Intellectual Property]"
 "[-copyright?" SH_RELEASE_CPYR "]"
+"[-license?http://www.eclipse.org/org/documents/epl-v10.html]"
+"[--catalog?" SH_DICT "]"
 "[+NAME?shcomp - compile a shell script]"
 "[+DESCRIPTION?Unless \b-D\b is specified, \bshcomp\b takes a shell script, "
 	"\ainfile\a, and creates a binary format file, \aoutfile\a, that "