Add missing compilation task.

The tests in this package depend on the common EL code so ensure it is
compiled before the test is packaged.

Signed-off-by: Mark Thomas <markt@apache.org>

src/com/sun/ts/tests/jsp/spec/el/jsp/build.xml

@@ -1,6 +1,7 @@
 <!--
 
-    Copyright (c) 2018 Oracle and/or its affiliates. All rights reserved.
+    Copyright (c) 2018, 2021 Oracle and/or its affiliates and others.
+    All rights reserved.
 
     This program and the accompanying materials are made available under the
     terms of the Eclipse Public License v. 2.0, which is available at
@@ -33,4 +34,9 @@
         </tscontent.war>
     </target>
 
+    <target name="compile">
+        <ts.javac includes="${pkg.dir}/**/*.java,
+                           ${elcommon.dir}/**/*.java"/>
+    </target>
+
 </project>