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

@@ -91,10 +91,14 @@
 $endif
 $if _x86 && _ELF64
 $add amd64
 $endif
 
+SYMBOL_VERSION ILLUMOS_0.20 {   # priv_defaultset
+        priv_defaultset;
+} ILLUMOS_0.19;
+
 SYMBOL_VERSION ILLUMOS_0.19 {   # flock
     protected:
         flock;
 } ILLUMOS_0.18;