msdk: segfault on Intel GPU < gen12 and using OneVPL dispatcher

Since !4177 (merged)

When gstreamer msdk is linked to OneVPL dispatcher library (libvpl.so), no elements are registered/available on Intel platforms with GPU < gen12. The OneVPL dispatcher uses the legacy MSDK runtime (libmfxhw64.so) for Intel GPU < gen12.

The issue is not observed for Intel GPU >= gen12, which the OneVPL dispatcher uses the OneVPL runtime (libmfx-gen.so).

Also, this issue is not observed if using the legacy MSDK dispatcher (libmfx.so) and MSDK runtime.

$ gst-inspect-1.0 msdk

(gst-plugin-scanner:418576): GStreamer-CRITICAL **: 15:38:20.502: gst_mini_object_ref: assertion 'mini_object != NULL' failed
(gst-plugin-scanner:418576): GStreamer-CRITICAL **: 15:38:20.502: gst_mini_object_ref: assertion 'mini_object != NULL' failed

ERROR: Caught a segmentation fault while loading plugin file:
/home/uaeoff/Work/workspace/media/install/lib/gstreamer-1.0/libgstmsdk.so

Please either:
- remove it and restart.
- run with --gst-disable-segtrap --gst-disable-registry-fork and debug.

(gst-plugin-scanner:418600): GStreamer-CRITICAL **: 15:38:20.566: gst_mini_object_ref: assertion 'mini_object != NULL' failed
(gst-plugin-scanner:418600): GStreamer-CRITICAL **: 15:38:20.567: gst_mini_object_ref: assertion 'mini_object != NULL' failed

ERROR: Caught a segmentation fault while loading plugin file:
/home/uaeoff/Work/workspace/media/install/lib/gstreamer-1.0/libgstmsdk.so

Please either:
- remove it and restart.
- run with --gst-disable-segtrap --gst-disable-registry-fork and debug.
0:00:00.694697913 418575       0xffac60 ERROR     GST_PLUGIN_LOADING gstpluginloader.c:279:plugin_loader_replay_pending: Plugin file /home/uaeoff/Work/workspace/media/install/lib/gstreamer-1.0/libgstmsdk.so failed to load. Blacklisting
No such element or plugin 'msdk'

I will gather a gdb backtrace and attach momentarily...