Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56516
Place declarations for all scripting variables marked with declare=true
at the start of the page so they are always visible to the entire page.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1594715 13f79535-47bb-0310-9956-ffa450edef68