dtksh: use bin/package flat make instead of shell

Shell isn't portable, so upstream ksh93 has a "flat" function that we can use
to put binaries in a static place that doesn't require a shell command. We still
do need an intermediate setup.sh shell script due to a bug in ksh that object
files aren't being put in lib, and FEATURE not in include. We also cut out some
 unused symbols, and a hpux specific implementation of dynlib (new hpux should
 conform to the posix implementation anyhow.)

cde/.gitignore

@@ -906,6 +906,7 @@ programs/dtinfo/tools/misc/pmaker
 programs/dtinfo/tools/misc/treeres
 
 # program/dtksh
+programs/dtksh/FEATURE
 programs/dtksh/dtksh
 programs/dtksh/suid_exec
 programs/dtksh/examples/CallDataTest4
@@ -1033,10 +1034,6 @@ programs/fontaliases/sun/ja/dtinfo.pcf.gz
 programs/fontaliases/sun/ja/dtinfo.pcf.Z
 programs/fontaliases/sun/ja/fonts.dir
 
-# programs/ksh93
-programs/dtksh/ksh93/man/man1/sh.1
-programs/dtksh/ksh93/man/man3/nval.3
-
 # programs/localized
 programs/localized/C/types/*.dt
 programs/localized/C/types/*.dt.tmsg