(maybe_objc_comptypes): Undo the previous
change and make the undecided return value from 2 to -1 to avoid
confusion with the values used by comptypes.
From-SVN: r4191
(maybe_objc_comptypes): Return 0
(incompatible) rather than 2 (similar enough) as the default.
This was an inadvertent change in the Objective-C merge.
From-SVN: r4153
