Make sure continuations of multi valued attributes (Class-Path) are

added to the correct instance

PR:	22816
Submitted by:	Dan Douglas


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275187 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Manifest.java

@@ -437,6 +437,8 @@ public class Manifest {
                 } else {
                     attribute = new Attribute(line);
                     String nameReadAhead = addAttributeAndCheck(attribute);
+                    // refresh attribute in case of multivalued attributes.
+                    attribute = getAttribute(attribute.getKey());
                     if (nameReadAhead != null) {
                         return nameReadAhead;
                     }