Use $(KORNSHELL) for dtksh as well

Use $(KORNSHELL) for dtksh as well

This commit updates master at de82eebdd56c02ae200bf2d9ec60df053919e7e7
to include bits from

   Message-Id: <1344951117-33716-3-git-send-email-saper@saper.info>
   http://thread.gmane.org/gmane.comp.desktop.cde.devel/283/focus=301

not included in the

   Message-Id: <1344951117-33716-1-git-send-email-saper@saper.info>
   http://thread.gmane.org/gmane.comp.desktop.cde.devel/283/focus=299

that was commited as d3206f451496035dbd5db5ed62a95e67e499c712

Also remove two generated files from the repository:
	programs/dtksh/ksh93/man/man1/sh.1
	programs/dtksh/ksh93/man/man3/nval.3

Conflicts:

	cde/programs/dtksh/ksh93/Imakefile