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Fix T60791: Don't show automatic weights option when not supported

There are probably many more cases in which the menu looks a little different.
However, I don't know them all and it's too easy to break something accidentally here.
Maybe a user could try the different combinations of object types and check if there are entries that should not be there.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D4240