It will be used by opengl vout_displays.

This reverts commit ce7a4746.
Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr>

This reverts commit b377e1af.
Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr>

Currently, we never read from RTP and RTCP sockets, so we might as well
set their RX buffer size to zero.

It does more harm than good, since some clients (RealPlayer) will
just throw out a "not enough bandwidth" error and fail to open the
stream.

Also remove unneeded encoder_sys_t member

Also remove unneeded encoder_sys_t member