Supporting zLinux (s390 and s390x) and PowerPC (ppc64)

The only changes were made in `binding.gyp`, just a couple of extra checks. It should not affect installation on the mainstream systems in any way. I've only been able to check it on Ubuntu 12.04, x86_64, but can't see why it would be different for anything else.

For testing:
```
npm install CGavrila/node-java
```