Back-port trunk:r1430567: Use java_home if exists to determine JAVA_HOME on Mac OS X.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1432355 13f79535-47bb-0310-9956-ffa450edef68
Updated changelog to include fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=54390 : Use java_home on Mac OS X.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1432356 13f79535-47bb-0310-9956-ffa450edef68