. Add support for bootstrapping with the Diablo Caffe JDK. The bootstrap
order is now:
. linux-blackdown-jdk13 iff WITH_LINUX_BOOTSTRAP is set.
. A previous installation of this port, if it exists.
. The Diablo Caffe JDK.
That is, the Diablo Caffe JDK is now the default bootstrapper in the
absence of a previous installation of this port.