Fixes 256-colour dvb subtitle encoding.

Fixes ticket #6769.

Adds a hunk forgotten in 8a6799d2

Fixes the following warning:
libavfilter/tests/filtfmts.c: In function ‘main’:
libavfilter/tests/filtfmts.c:103:18: warning: assignment discards ‘const’ qualifier from pointer target type

* commit '75ef9154':
  configure: Disable inline assembly for PathScale compilers
Merged-by: James Almer <jamrial@gmail.com>

* commit 'fe6eea99':
  nsvdec: don't ignore the return value of av_get_packet()

This commit is a noop, see
edf1cb7a
8d7ce5cdMerged-by: James Almer <jamrial@gmail.com>

* commit 'd4f3c26b':
  rtmpproto: send swfverify value as swfurl if latter is unused

This commit is a noop, see c0b3781bMerged-by: James Almer <jamrial@gmail.com>

* commit 'd6390090':
  configure: Skip check for inline assembly capabilities when explicitly disabled
Merged-by: James Almer <jamrial@gmail.com>

* commit '083ea876':
  APIchanges: Update bump dates
Merged-by: James Almer <jamrial@gmail.com>

* commit '8c616b3b':
  avplay: Use the named syntax for buffersrc arguments

This commit is a noop, see 251f3987Merged-by: James Almer <jamrial@gmail.com>

* commit '883ce264':
  vf_showinfo: Display spherical properties
Merged-by: James Almer <jamrial@gmail.com>

* commit '3f128fc4':
  vf_showinfo: Simplify reporting stereo3d information
Merged-by: James Almer <jamrial@gmail.com>

* commit '5f90ad99':
  spherical: Change types of bounding and pad to uint32_t

This commit is a noop, see f20bcec4Merged-by: James Almer <jamrial@gmail.com>

* commit '35cf146a':
  lavu: Drop deprecated av_dlog macro
Merged-by: James Almer <jamrial@gmail.com>

* commit '619a433e':
  lavu: Drop deprecated option type
Merged-by: James Almer <jamrial@gmail.com>

* commit 'dd343fd9':
  lavu: Drop deprecated VDPAU pixel formats
Merged-by: James Almer <jamrial@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '0648dec1':
  lavc: Drop deprecated stream codec tag
Merged-by: James Almer <jamrial@gmail.com>

* commit '94eed68a':
  lavc: Drop deprecated options moved to private contexts
Merged-by: James Almer <jamrial@gmail.com>

Deprecated in 07/2015.
Signed-off-by: James Almer <jamrial@gmail.com>

* commit 'c43a96fe':
  lavc: Drop deprecated time_base variable for decoding

This commit is a noop. The API has been postponed.
Merged-by: James Almer <jamrial@gmail.com>

Deprecated in 08/2014.
Signed-off-by: James Almer <jamrial@gmail.com>

* commit '48bb0da0':
  lavc: Drop deprecated way of setting audio delay on encode
Merged-by: James Almer <jamrial@gmail.com>

* commit '5182a28b':
  lavc: Drop deprecated global afd field
Merged-by: James Almer <jamrial@gmail.com>

* commit '4476027d':
  lavc: Drop deprecated avctx codec name
Merged-by: James Almer <jamrial@gmail.com>

* commit 'bb45d112':
  lavc: Drop deprecated codec flags
Merged-by: James Almer <jamrial@gmail.com>

* commit '30255483':
  lavc: Drop deprecated unused public members
Merged-by: James Almer <jamrial@gmail.com>

* commit 'b3739599':
  lavc: Drop deprecated emu edge functionality
Merged-by: James Almer <jamrial@gmail.com>

* commit '06c20d3e':
  lavc: Drop deprecated av_fast_malloc() compatibility

This commit is a noop.
Merged-by: James Almer <jamrial@gmail.com>

* commit 'da5ba26b':
  lavc: Drop deprecated macroblock type symbols
Merged-by: James Almer <jamrial@gmail.com>

* commit 'cbebc325':
  lavc: Drop deprecated public symbols
Merged-by: James Almer <jamrial@gmail.com>

* commit '72dc7ddd':
  lavc: Drop deprecated error rate option
Merged-by: James Almer <jamrial@gmail.com>

Replaces the now dropped global option.

Addresses ticket #6771.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

* commit 'dcc39ee1':
  lavc: Remove deprecated XvMC support hacks
Merged-by: James Almer <jamrial@gmail.com>

* commit '0871e233':
  lavc: Drop deprecated architectures symbols
Merged-by: James Almer <jamrial@gmail.com>

* commit 'c06e7392':
  lavc: Drop deprecated extended aspect ratio symbol
Merged-by: James Almer <jamrial@gmail.com>

* commit '0c7986df':
  lavc: Drop deprecated workaround bugs options
Merged-by: James Almer <jamrial@gmail.com>

* commit '8933ac20':
  lavc: Drop deprecated debug mv functionality

This commit is a noop. A discussion is currently ongoing about the
removal of this feature.
Merged-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

This was missed in e754c8e8 / e2710e79 since those functions
weren't exercised by checkasm.

Fixes ticket #6766.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>