Silence lots of warnings in lib/DtHelp.

* 64bit warnings
* Missing prototypes
* explicit parentheses / brackets

There's still some work to be done, but, as always, it's a start ...

cde/lib/DtHelp/FormatCCDF.c

@@ -5206,7 +5206,7 @@ _DtHelpCeGetCcdfTitleChunks(
     _FrmtUiInfo		  *ui_info,
     void		***ret_chunks)
 {
-    int		  type   = 0;
+    long	  type   = 0;
     int		  result = 0;
     int		  offset;
     char	 *fileName;