Introduce DTKORNSHELL, analogous to KORNSHELL.

DTKORNSHELL is used to specify the install location of dtksh on your system,
preventing hardcoding of /usr/dt/bin/dtksh in Shebang lines and such.

cde/config/cf/Imake.tmpl

@@ -183,6 +183,9 @@ XCOMM the platform-specific parameters - edit site.def to change
 #ifndef KornShell
 #define KornShell		/bin/ksh
 #endif
+#ifndef DtKornShell
+#define DtKornShell		/usr/dt/bin/dtksh
+#endif
 #ifndef ConstructMFLAGS
 #if SystemV
 #define ConstructMFLAGS		YES	/* build MFLAGS from MAKEFLAGS */
@@ -896,6 +899,7 @@ XCOMM the platform-specific parameters - edit site.def to change
           PATHSEP = PathSeparator
             SHELL = BourneShell
         KORNSHELL = KornShell
+      DTKORNSHELL = DtKornShell
 
               TOP = TOPDIR
       CURRENT_DIR = CURDIR

cde/config/cf/OpenBSD.cf

@@ -1028,6 +1028,10 @@ install:: fonts.alias							@@\
 #define KornShell               /usr/local/bin/ksh93
 #endif
 
+#ifndef DtKornShell
+#define DtKornShell		/usr/local/dt/bin/dtksh
+#endif
+
 #define AvoidNullMakeCommand	YES
 
 /* This must come last */