Function gstreamer_sys::gst_event_new_instant_rate_sync_time

pub unsafe extern "C" fn gst_event_new_instant_rate_sync_time(
    rate_multiplier: c_double, 
    running_time: GstClockTime, 
    upstream_running_time: GstClockTime
) -> *mut GstEvent

This is supported on crate feature v1_18 only.