Correct test of OptionsImpl argc type (Was: Correct type for std::array size() result) (#9290)
Correct test of OptionsImpl argc type (Was: Correct type for std::array size() result) (#9290)

The std::array API uses std::size_t for the size() nelts count.
This is a larger sized int than 'int', which causes this code
to break on Windows compilation.

Use the stdcxx type for conformance and portability.

Signed-off-by: Sunjay Bhatia <df2d57be7987a471915f625a5499155bc16d4200@pivotal.io>
Signed-off-by: William A Rowe Jr <6b594a7cef7896b2a5c8742c6f375a4f1966bff1@pivotal.io>
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