cleanup: eliminate "implicit declaration" warnings.

Also fixed a potential core/memory corruption in dticon.

cde/programs/dthelp/dthelpdemo/HelpCache.c

@@ -43,7 +43,8 @@
  ************************************<+>*************************************/
 
 /* System Include Files  */
-
+#include <stdlib.h>
+#include <stdio.h>
 
 #include <Xm/Xm.h>
 #include <Xm/XmP.h>

cde/programs/dthelp/dthelpdemo/Main.c

@@ -42,6 +42,9 @@
  ****************************************************************************
  ************************************<+>*************************************/
 
+#include <stdlib.h>
+#include <stdio.h>
+
 #include <Xm/Xm.h>
 #include <Xm/RowColumn.h>
 #include <Xm/PushB.h>
@@ -624,7 +627,7 @@ static void ManageButtonsCB(
 
   TurnOnHourGlass(topLevel);
 
-  switch ((int)clientData)
+  switch ((long)clientData)
     {
       case CREATE_SAMPLE:
    
@@ -745,7 +748,7 @@ static void Control1ButtonsCB(
 
   TurnOnHourGlass(topLevel);
 
-  switch ((int)clientData)
+  switch ((long)clientData)
     {
       case CHANGE_CONTENT:
          
@@ -881,14 +884,14 @@ static void HelpMenuCB(
   /* Determine which help button was activated and display the
    * appropriate help information */
 
-   switch ((int)clientData)
+   switch ((long)clientData)
 	   {
 	     case HELP_ON_ITEM:
                while (!XtIsSubclass(widget, applicationShellWidgetClass))
                    widget = XtParent(widget);
 
 
-               status = DtHelpReturnSelectedWidgetId(widget, NULL, &selWidget);
+               status = DtHelpReturnSelectedWidgetId(widget, 0, &selWidget);
 
                 switch ((int)status)
 	          {

cde/programs/dthelp/dthelpprint/Main.c

@@ -41,6 +41,7 @@ $COPYRIGHT$:
  * to determine how the lines are drawn.
  */
 #include <stdio.h>
+#include <stdlib.h>
 #include <locale.h>
 #include <X11/Xlib.h>
 #include <X11/Xresource.h>
@@ -108,7 +109,7 @@ int main(
    if (options.debugHelpPrint)
    {
       XrmPutFileDatabase(appDB,"db.dthelpprint"); /* dump rsrc for debug */
-      system("cat db.dthelpprint|fgrep -i print");
+      system("/bin/cat db.dthelpprint|/bin/fgrep -i print");
    }
 
    /****************************************

cde/programs/dthelp/parser/canon1/util/wchar.c

@@ -25,6 +25,7 @@
 	       Copyright 1992 Hewlett-Packard Co.
 */
 
+#include <string.h>
 #include "basic.h"
 #include "trie.h"
 #include "cont.h"

cde/programs/dthelp/parser/pass2/util/wchar.c

@@ -25,6 +25,7 @@
 	       Copyright 1992 Hewlett-Packard Co.
 */
 
+#include <string.h>
 #include "basic.h"
 #include "trie.h"
 #include "cont.h"