Remove sys_pre_expand

The previous commits have made sys_pre_expand superfluous. Since
sys_pre_expand is undocumented and unsupported it can be removed in
a major release without prior deprecation.

Also remove code in erl_parse that handles abstract code that has
passed through sys_pre_expand.

We considered deprecating sys_pre_expand just in case, but decided
against it for the following reasons:

- Anyone brave and knowledgeable enough to use sys_pre_expand should
be able to cope with sys_pre_expand being removed.

- If we kept it, but didn't test it anywhere in OTP, it could
potentially stop working. So we would probably have to add some test
cases.

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