build: Separate building programs linking against libav* from building av*

This will allow cleaner integration of building example programs.
build: Integrate multilibrary examples into the build system

This includes moving libavformat/output-example to doc/examples/output.
aacsbr: Add some const casts to silence warnings in ff_sbr_apply()
avcodec/ac3dec: check bap before use.

Fixes out of array read
Fixes assertion failure
Fixes asan_static-oob_16431c0_8036_rio_bravo_mono_64_spx.ac3

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
vc1: Reset numref if fieldmode is not set

There are samples in the wild with B-frames and P-frames with different
interlace mode.

CC: libav-stable@libav.org
Reported-by: Jean-Baptiste Kempf <jb@videolan.org>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Merge commit '14abeaa43d021afdce9119d906891abe89c03b88'

* commit '14abeaa43d021afdce9119d906891abe89c03b88':
  build: Separate building programs linking against libav* from building av*

Conflicts:
	Makefile
	doc/Makefile

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'ab81f24ad43bddf77ddd25cba86780c1c884996c'

* commit 'ab81f24ad43bddf77ddd25cba86780c1c884996c':
  build: Integrate multilibrary examples into the build system

Conflicts:
	configure
	doc/Makefile
	doc/examples/muxing.c
	doc/examples/output.c
	libavformat/Makefile
	libavformat/output-example.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Makefile: Fix building progs out of progs_g

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc/Makefile fix PROGS

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  aacsbr: Add some const casts to silence warnings in ff_sbr_apply()

Conflicts:
	libavcodec/aacsbr.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
metasound: add last missing modes (8kHz @ 6kbps per channel)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
MSN Audio support

This is essentially a MS GSM decoder extension that supports more
sampling rates and lower bitrates.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
mpeg12dec: Extract CC user data into frame side data

Signed-off-by: Anton Khirnov <anton@khirnov.net>
lavc: remove mp3_header_(de)compress bitstream filters

They mangle the mp3 header in a non-standard way to save a few bytes.
People who care about space so much should just use a more efficient
codec.
configure: define CONFIG_THIS_YEAR at the configure level

The macro value can be shared between configure script and cmdutils.c.
cmdutils: remove this_year constant, use CONFIG_THIS_YEAR instead

Simplify.
Merge commit 'de44dfc7c0ec02bda7d846ef713145c890bfae3f'

* commit 'de44dfc7c0ec02bda7d846ef713145c890bfae3f':
  vc1: Reset numref if fieldmode is not set

This change is redundant, numref is already reset

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '56d061ce9da954560892e3551513d5ecc0439846'

* commit '56d061ce9da954560892e3551513d5ecc0439846':
  metasound: add last missing modes (8kHz @ 6kbps per channel)

Conflicts:
	Changelog
	doc/general.texi

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'a16577d9857206089fd8bce6a342b31dbd7fb9b0'

* commit 'a16577d9857206089fd8bce6a342b31dbd7fb9b0':
  MSN Audio support

Conflicts:
	libavformat/riff.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Revert "avcodec/gsmdec: reject unsupported msn audio modes"

they should be supported now

This reverts commit 1ee1a3d9f4e152b641f05d2be6dbe3f440485cca.