gdi32/tests: test GetTextExtentExPoint behavior with zero and negative max extent values

[Thomas Faber]

As discovered by my riched20 experience, GetTextExtentExPoint treats
negative max_extent values specially and probably casts them to an
unsigned type.
Additionally, the Ansi version fails for values less than -1.

These tests demonstrate that, with todo_wine added where behavior
diverges.
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