Java 8 workaround

Java 8 segfaults during install.
Installing OpenJDK 11 first prevents Java 8 from running.

stage5/00-install-extras/00-run.sh

@@ -0,0 +1,8 @@
+#!/bin/bash -e
+
+on_chroot << EOF
+apt-get install openjdk-11-jre-headless -y --no-install-recommends
+#update-binfmts --package openjdk-11 --remove jar /usr/bin/jexec
+apt-get purge openjdk-11-jre-headless openjdk-8-jre-headless+ -y
+apt-mark auto openjdk-8-jre-headless
+EOF