CI builds of openjdk-8 yield bad file permissions and a broken java installation

Downloading an image from snapshots.linaro.org (from around 13.10 onwards) yields a broken installation of Java.

The file permissions on some files are 0600 which I suspect may be a umask problem during the build as my local builds don't exhibit the same issue. Example of broken permissions:

root@genericarmv8:/usr/lib/jvm/java-8-openjdk# find . -perm 0600
./lib/jconsole.jar
./lib/tools.jar
./lib/ct.sym
./lib/dt.jar
./jre/lib/charsets.jar
./jre/lib/jsse.jar
./jre/lib/jce.jar
./jre/lib/security/US_export_policy.jar
./jre/lib/security/local_policy.jar
./jre/lib/ext/localedata.jar
./jre/lib/ext/nashorn.jar
./jre/lib/ext/sunpkcs11.jar
./jre/lib/ext/zipfs.jar
./jre/lib/ext/sunec.jar
./jre/lib/ext/sunjce_provider.jar
./jre/lib/ext/dnsns.jar
./jre/lib/ext/cldrdata.jar

which means things like java will fail to compile a program (when run as a non-root user).

We can fix this in two ways: 1) change umask on build server (assuming this is the issue) or 2) update the do_install script for openjdk-8 to correct file permission for group and other. I favour 2.

However, right now java is broken for 13.10.