Low-hanging fruit: Fix most warnings in lib/DtSearch.

Most of these are related to missing includes and prototypes as well as
parens/braces.  A few are also potential 64bit issues.

cde/lib/DtSearch/raima/destroy.c

@@ -54,6 +54,7 @@
 /* Warning: this function will destroy the entire contents
    of the database
 */
+int
 d_destroy(dbname TASK_PARM)
 CONST char FAR *dbname;
 TASK_DECL