uts: add a concept of a 'default' set of privileges, separate from 'basic'

@@ -181,10 +181,11 @@
  */
 #define PRIV_INFO_SETNAMES              0x0001
 #define PRIV_INFO_PRIVNAMES             0x0002
 #define PRIV_INFO_BASICPRIVS            0x0003
 #define PRIV_INFO_FLAGS                 0x0004
+#define PRIV_INFO_DEFAULTPRIVS          0x0005
 
 /*
  * Special "privileges" used to indicate special conditions in privilege
  * debugging/tracing code.
  */