erlang: stop shipping sasl in the base package

erlang: stop shipping sasl in the base package

Package/erlang/install copies erts, kernel, sasl and stdlib into
/usr/lib/erlang/lib, and BuildModule builds erlang-sasl from the very
same sasl directory, so both packages own
usr/lib/erlang/lib/sasl-*/ebin/*.beam.

apk refuses to overwrite files owned by another package, so installing
erlang-sasl next to erlang fails:

  ERROR: erlang-sasl-28.5-r1: trying to overwrite
  usr/lib/erlang/lib/sasl-4.3.2/ebin/alarm_handler.beam
  owned by erlang-28.5-r1.

That also takes down erlang-os-mon and erlang-reltool, which depend on
erlang-sasl. The overlap dates back to the import from the old packages
feed and only surfaced once CI started run-testing the subpackages.

Leave sasl to erlang-sasl, which is what that subpackage is for. The
base package keeps bin/start_sasl.boot: it is inert while the runtime
boots via start_clean, and it is needed once erlang-sasl is installed.

Signed-off-by: Josef Schlehofer <redacted>