WIP: Request to remove ruby 1.8 from the tree

To continue the discussion on #1272 , ruby 1.8 is unsupported by the ruby dev team and has known vulnerability issues. I propose to we remove it from the tree.

There's two blockers: klinkstatus and s3sync.

klinkstatus seem to compile fine without ruby18 but I'm not sure exactly how the kde {} derivation work.

s3sync seems to be an old ruby1.8 script that interacts with S3. It doesn't seem to be maintained anymore: http://s3sync.net/wiki ( the new maintainer has just pushed 1 commit and didn't release anything). Either find a replacement, upgrade the script or just remove it all-together.

TODO:

* [x] klinkstatus
* [ ] Find a solution for s3sync
* [ ] actually remove ruby18