gstpythonplugin: Don't use pyg_gil_* in pure python. Fixes #583378
gstpythonplugin: Don't use pyg_gil_* in pure python. Fixes #583378

At this point, pygobject wasn't loaded yet ... cause pyg_gil_state_ensured
to not be initialized to the proper method.

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