Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=48616, a regression caused...

Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=48616, a regression caused by the fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=42390
The requirement for variable declaration also depends on whether or not a fragment helper has been used for the parent tag (if any). Where such a helper has been used, the variables must be redefined.
Test cases for both bugs and the JSP TCK pass with this patch applied.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@905145 13f79535-47bb-0310-9956-ffa450edef68