Backport of "glmixerbin: slightly better pad/element creation" into 1.20
requested to merge tpm/gstreamer:backport-mr-2038-into-1.20-glmixerbin-link-pads-bin-add-use-ret into 1.20
Backport of !2038 (merged) "glmixerbin: slightly better pad/element creation".
Commits:
- b2232c5c glmixerbin: slightly better pad/element creation