arg-types: Remove guint8* argtype.
arg-types: Remove guint8* argtype.

Partially reverts 7aef2834cff525906db15b4af0ee54b723bdd083

lubosz/gst-python,lubosz/gst-python,freedesktop-unofficial-mirror/gstreamer-sdk__gst-python,pexip/gst-python,pexip/gst-python,freedesktop-unofficial-mirror/gstreamer-sdk__gst-python,lubosz/gst-python,freedesktop-unofficial-mirror/gstreamer-sdk__gst-python,GStreamer/gst-python,GStreamer/gst-python,freedesktop-unofficial-mirror/gstreamer__gst-python,freedesktop-unofficial-mirror/gstreamer__gst-python,alessandrod/gst-python,alessandrod/gst-python,freedesktop-unofficial-mirror/gstreamer-sdk__gst-python,alessandrod/gst-python,freedesktop-unofficial-mirror/gstreamer__gst-python,GStreamer/gst-python,pexip/gst-python