[LEDE-DEV] Adding host Java support to the buildbots

[Dana Myers]

In reference to https://github.com/openwrt/packages/pull/3686

We've added OpenWRT support for:

* JamVM 2.0: Java JVM
* GNU Classpath 2.0: Java class library
* RXTX Java serial communications library

However, the build bots won't build these packages yet because
a host Java compiler is required. To build these packages, I
install:

     openjdk-7-jdk

(which also pulls in openjdk-7-jre and openjdk-7-jre-headless)

What needs to be done to add openjdk-7-jdk to the build bots?

Thank you,
Dana

danak6jq at github
k6jq at comcast.net