java-1.8.0-openjdk security, bug fix, and enhancement update

1:1.8.0.342.b07-1 - Update to shenandoah-jdk8u342-b07 - Update release notes for shenandoah-8u342-b07. - Print release file during build, which should now include a correct SOURCE value from .src-rev - Update tarball script with IcedTea GitHub URL and .src-rev generation - Use 'git apply' with...