Backport of "gstpluginloader: show the reason when spawning of gst-plugin-scanner fail" into 1.20
Backport of !1578 (merged) "gstpluginloader: show the reason when spawning of gst-plugin-scanner fail".
Commits:
- 6676b1e7 gstpluginloader: show the reason when spawning of gst-plugin-scanner fail