dtksh: Upgrade ksh93 to 1.0.0-beta.2 2021-12-28

Patch from current ksh93 maintainer <https://github.com/ksh93/ksh>.

cde/programs/dtksh/ksh93/**:
- Upgraded. A load of bugs fixed, some minor features added.
  See NEWS from 2021-02-01 upwards.

cde/programs/dtksh/Makefile.am:
- Don't cd into ksh93 any more to invoke the package or shtests
  scripts; they now automatically find their directories.
- Pass $(CFLAGS) to build ksh with optimisation.
- Remove -D_std_malloc flag as vmalloc is now deprecated and disabled
  by default.
- Add a 'make check' target to Makefile.am that runs the ksh93
  regression tests on dtksh to make sure the additions don't interfere
  with anything. It skips running the tests with shcomp because CDE
  doesn't use that. The tests all pass here on Slackware 14.2. :-)

cde/programs/dtksh/init.patch:
- Removed; I've upstreamed it. It was the only one that wasn't upstreamed
  yet, and more code cleanups are coming, breaking downstream patches. If
  something needs updating, just email me a diff.

cde/programs/dtksh/dtkcmds.h:
- Update the ADDBUILTIN macro to remove the __PROTO__ macro use. The
  proto(1) tool, responsible for all such pre-C89 K&R C compatibility
  voodoo, has been removed, so that macro is no longer defined.

cde/programs/dtksh/setup.sh:
- Workaround script removed. I rewrote 'bin/package flat make' in a way
  that works correctly and changed Makefile.am to use that instead.

Hope this helps. Happy new year.

cde/programs/dtksh/ksh93/docs/ksh/features.html

@@ -21,7 +21,7 @@ dd	{ margin-left:3em; }
 <P><CENTER><FONT color=red><FONT face=courier><H3><A name="ksh features">ksh features</A></H3></FONT></FONT></CENTER>
 KSH-93 is the most recent version of the KornShell Language described in
 <EM>The KornShell Command and Programming Language</EM>,
-by Morris Bolsky and David Korn of AT&amp;T Research (nee Bell Laboratories).
+by Morris Bolsky and David Korn of AT&amp;T Research.
 The KornShell is a shell programming language,
 which is upward compatible with
 <EM>sh</EM>
@@ -39,7 +39,7 @@ In addition,
 scripts can be run on KSH-93 without modification.
 <P>
 The code should conform to the IEEE POSIX 1003.1 standard and to the
-proposed ANSI-C standard so that it should be portable to all
+proposed ANSI C standard so that it should be portable to all
 such systems.
 Like the previous version, KSH-88,
 it is designed to accept eight bit character sets
@@ -120,7 +120,7 @@ Almost the complete set of C language operators are available
 with the same syntax and precedence.
 Arithmetic expressions can be used to as an argument expansion 
 or as a separate command.
-In addition there is an arithmetic for command that works
+In addition, there is an arithmetic for command that works
 like the for statement in C.
 
 <P>