acinclude.m4: use a better way to find the correct PYTHON_LIB_LOC.
acinclude.m4: use a better way to find the correct PYTHON_LIB_LOC.

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