hevc/rext: fixing rdpcm and scaling list for Range Extension

-new rext bitstreams:
PERSIST_RPARAM_A_RExt_Sony_1.bit           ok    =
QMATRIX_A_RExt_Sony_1.bit                  ok    =
SAO_A_RExt_MediaTek_1.bit                  ok    =

(cherry picked from commit cdea029d452c521f8e5bcbe589f44b13a4011604)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavf/segment: do not allow to create segments with no key-frames

Fix trac ticket #3749.
lavf/segment: sanitize segment end time in case last packet do not have a defined duration

In particular, avoids to set segments with duration set to 0
(e.g. segment with a single reference frame for which duration is
undefined).
hevc/rext: remove warning for cross component prediction

cherry picked from commit fb595102593c94179502bb1967f978a1d99cc7cb

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
fate/hevc: update with new Rext bitstreams

cherry picked from commit d0924959f16d42630cfd7b3b4fce9fead60a4aa8

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>