Fix to compile warnings.

* discarded-qualifiers warnings.
* Function definitions, the .h doesn't match the .c.
* Added some include to ensure the .c has function definition.

cde/lib/DtHelp/Print.c

@@ -74,6 +74,7 @@
  * private includes
  */
 #include "DisplayAreaI.h"
+#include "DisplayAreaP.h"
 
 #include "bufioI.h"
 #include "Access.h"