Only invalidate defined symbols

Think I had it in the back of my head somewhere that not invalidating
undefined symbols could break some obscure cases, but turns out it's
perfectly safe: Nothing can change the value of an undefined symbol.
They always get their name as their value.

There's no need to unset user values on them either, because
set_user_value() already refuses to to set one on them.

Lets us get rid of the Python 2/3 compatibility hack and instead iterate
over a plain list of defined symbols.

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