rocksDB has no libraries for z/OS and iSeries

> Note: Please use Issues only for bug reports. For questions, discussions, feature requests, etc. post to dev group: https://www.facebook.com/groups/rocksdb.dev

### Expected behavior
An application using rocksDB should work in z/OS and iSeries operating systems

### Actual behavior
It gives an error "cannot determine JNI library name for OS='z/os' name='rocksdb' "

### Steps to reproduce the behavior
Run an application that uses rocksDB on z/OS

Can you provide rocksdb libraries for z/OS and iSeries ? How long would that take ? Thanks !