Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55807
The JSP compiler used a last modified time of -1 for TLDs in JARs expanded in to WEB-INF/classes (IDEs often do this expansion) when creating the dependency list for JSPs that used that TLD. This meant JSPs using that TLD were recompiled on every access.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1546185 13f79535-47bb-0310-9956-ffa450edef68