The `add_post_type_support()` function accepts an optional third parameter that allows extra arguments to be supplied to configure post type support for a given feature. However, because of how `register_post_type()` and `WP_Post_Type->add_supports()` work, it is currently impossible to pass these additional arguments when initially registering a post type with `register_post_type()`.
This change makes it possible to supply additional arguments for a feature using the `supports` argument of `register_post_type()`.
Props MaximeCulea, seuser, desrosj, johnbillion.
Fixes#40413.
git-svn-id: https://develop.svn.wordpress.org/trunk@46160 602fd350-edb4-49c9-b593-d223f7449a82