erlang: bump version to 19.3

erlang: bump version to 19.3

This change bumps the Erlang version from 18.3 to 19.3. Erlang 19.0 has
many improvements but introduces a few incompatible changes to Erlang
18.3. Details are at:

  http://erlang.org/download/otp_src_19.0.readme

The 19.x minor releases primarily contain bug fixes, optimizations and
other minor imporvements. Details are at:

  http://erlang.org/download/otp_src_19.1.readme
  http://erlang.org/download/otp_src_19.2.readme
  http://erlang.org/download/otp_src_19.3.readme

Signed-off-by: Frank Hunleth <fhunleth@troodon-software.com>
Tested-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>