fix PyMemberDef type of two attributes

[kulikjak]

Two members of the main MYSQL structure are incorrectly defined as unsigned integers rather than unsigned longs in a PyMemberDef declaration. This can result in incorrect values being returned (I found this on SPARC, where client_flag attribute was always zero).

For reference, here is the declaration in the MySQL code (same for 5.5, 5.6, 5.7 and 8.0):
https://github.com/mysql/mysql-server/blob/5.7/include/mysql.h#L287

[codecov]

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