openjdk7: add icedtea 2.4.5

Hi,
I've added some recipes for IcedTea 2.4.5. Please take a closer look at them!

I've tested the build only for ARMv7, but therefore it works well:
```
root@arm7:~# java -version
java version "1.7.0_51"
OpenJDK Runtime Environment (IcedTea 2.4.5) (51b31-2.4.5)
OpenJDK Zero VM (build 24.51-b03, interpreted mode)
```

I'm awaiting your comments and feedback!

regards,
Richard