Log Message:
Update erlang, erland-doc and erlang-man to 12.0, aka R12B-0.

This builds again on x86_64 platforms, is@ will test further.

This release supports new language extensions bitstring and binary
comprehensions.

Other major changes are listed on <http://www.erlang.org/doc/highlights.html>.
See <http://www.erlang.org/download/otp_src_R12B-0.readme> for full detail.