Build: Fix javac.classpath in junit.compileTest targets (ticket #2333)

core/java/build.xml

@@ -171,7 +171,7 @@
         <mkdir dir="./build/obj_scala" />
         <scalac srcdir="./test/scalatest" destdir="./build/obj_scala" deprecation="on" >
             <classpath>
-                <pathelement location="${javac.classpath.mod}" />
+                <pathelement path="${javac.classpath.mod}" />
                 <pathelement location="${scala-library.jar}" />
                 <pathelement location="${scalactic.jar}" />
                 <pathelement location="${scalatest.jar}" />