vaapipostroc: GLTextureUploadMeta in sink template
vaapipostroc: GLTextureUploadMeta in sink template

Advertise GLTextureUploadMeta in sink caps template.

https://bugzilla.gnome.org/show_bug.cgi?id=752130

gbeauchesne/gstreamer-vaapi,gbeauchesne/gstreamer-vaapi,gbeauchesne/gstreamer-vaapi