core: Set 65KiB blocksize on gst source element
core: Set 65KiB blocksize on gst source element

The default is usually 4KiB which is not really big enough.

Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,Tarnyko/rygel,luisbg/rygel,jku/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,GNOME/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched