sexplib310 is marked for autoremoval from testing

[Debian testing autoremoval watch]

sexplib310 113.33.03-3 is marked for autoremoval from testing on 2017-12-02

It is affected by these RC bugs:
877496: sexplib310: sexplib310 FTBFS: Error: This expression has type Obj.t but 
an expression was expected of type extension_constructor