6662 uts should only build the variant requested

@@ -46,11 +46,11 @@
 def             :=      TARGET= def
 def.prereq      :=      TARGET= def
 all             :=      TARGET= all
 all.prereq      :=      TARGET= all
 install         :=      TARGET= install
-install.prereq  :=      TARGET= all
+install.prereq  :=      TARGET= install
 clean           :=      TARGET= clean
 clobber         :=      TARGET= clobber
 lint            :=      TARGET= lint
 lint.prereq     :=      TARGET= lint
 modlintlib      :=      TARGET= modlintlib