Took advantage of the sophisticated abstractions available in ant

to cut and paste the entirety of r21723 a little further down the
build file.  No review.

git-svn-id: http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk@21753 5e8d7ff9-d8ef-0310-90f0-a4852d11357a

build.xml

@@ -1116,6 +1116,7 @@ BOOTSTRAPPING BUILD (STRAP)
       <compilationpath>
         <pathelement location="${build-strap.dir}/classes/library"/>
         <pathelement location="${build-strap.dir}/classes/compiler"/>
+        <pathelement location="${build-strap.dir}/classes/continuations-plugin"/>
       </compilationpath>
     </scalacfork>
     <copy