Referencing internal type with lib name

[rkb9572]

I am getting a compilation error from the referencing of set:set() [line 64] and dict:dict() [line 66] in eunit_serial.erl when compiling against R16B on my mac running mavericks. I have fixed it locally and would be happy to make a pull request. Looks like the fix works back several versions of stdlib.

[richcarl]

First, compare with the version in Erlang/OTP 17.0 to see if it's already been fixed there.