ocaml-re2 is marked for autoremoval from testing

[Debian testing autoremoval watch]

ocaml-re2 113.00.00+dfsg-2.1 is marked for autoremoval from testing on 
2016-09-18

It (build-)depends on packages with these RC bugs:
833513: janest-core-kernel: Core needs update to cope with PPX-style syntax 
extensions