Added some code to parse $JAVA_HOME/release instead of source it, which lets us use $JAVA_RELEASE_VERSION for the AppCDS archive which may be more correct and will handle Graal better

I think we need to detect whether we found a JAVA_HOME a different way that works without the release file; perhaps $JAVA_HOME/bin/java?

The problem with this is we find JAVA_HOME by trimming /bin/java from the path to java, if we add that back on it will always match