[lazarus] Patch: Menuitem.Owner = nil -> invalid type cast (win32)

[Micha Nelissen]

Hi,

Based on the assumption that the owner of a menuitem is a form, I recommend
the following patch. It now checks whether there is a valid pointer and this
is of type tcustomform, which is what DrawMenuBar expects.

If Michael thinks it's OK, please commit.

Regards,

Micha.

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