Backport of "vaapipostproc: don't do any color conversion when GL_TEXTURE_UPLOAD" into 1.16
requested to merge tpm/gstreamer-vaapi:backport-mr-82-into-1.16-no-color-conversion-gl-upload into 1.16
Backport of !82 (merged) "vaapipostproc: don't do any color conversion when GL_TEXTURE_UPLOAD".
Commits:
- 838045b9 vaapipostproc: don't do any color conversion when GL_TEXTURE_UPLOAD