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arg-cache: Scalar out parameters should not be caller-allocates

Philip Chimento requested to merge ptomato/gjs:570-caller-allocates-scalar-types into master

The (out caller-allocates) annotation is for structured types that need to be allocated for the function to fill in. Caller-allocates for scalar types is a mistake, so mark the function non-introspectable because otherwise it will return the value of the pointer.

If needed, in the future we could add another argument cache marshaller to handle this, but let's see if we can get all the faulty annotations fixed upstream first.

Closes: #570 (closed)

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