use-project didn't actually do what the comment promised.

This triggered an error with thread Jamfile that could be seen when bjam was invoked in rootdir with
bjam --with-wave.

[SVN r44774]

Jamroot

@@ -497,7 +497,7 @@ rule boost-install ( libraries * )
 }
 
 # Make project ids of all libraries known.
-for local l in $(libraries)
+for local l in $(all-libraries)
 {
     use-project /boost/$(l) : libs/$(l)/build ;
 }