Log Message:
Update lang/erlang* to 18.3.

Some highlights of the release are:

- New statistics info about runnable and active processes & ports.
- Time warp improvements: dbg:p/2 and erlang:trace/3 with
  monotonic_timestamp | strict_monotonic_timestamp.
- Introduced a validation callback for heart.
- The module overload in sasl has been deprecated.
- ~90 contributions since 18.2

Full release notes:

  http://erlang.org/download/otp_src_18.3.readme