Revert "Revert "lavf/Makefile: fix standalone compilation of live_flv demuxer""

This reverts commit 8bc484768bd5e04a3be3d64dd059c22b4c0f03b9.
Revert "configure: remove superfluous check for AVX/FMA3 support in Yasm"

This reverts commit e93028790087e632569e94f193b333073a67cf14.
Revert "Revert "Revert "avcodec: add simpleauto idct"""

This reverts commit 3f4e89d9425a278a76a20b02212f3e8fa6092ece.
Revert "Revert "configure: Drop duplicate pkg-config entry from help output""

This reverts commit d7de404f1faeace1dd2c5f5d4fecbc3fb1bbeba0.
Revert "doc/bitstream_filters: document imxdump"

This reverts commit eba453e03ffeec8bb79cdcf35698e0fa13cc6d6e.
Revert "stereo3d: add missing include guards"

This reverts commit 440842c4eb1d7709654ec97cd687663d11ef499c.
Revert "alpha/blockdsp: move clear_blocks out of dsputil"

This reverts commit 05d95c53a70f983c124da112553502f7bcfec640.
Revert "avformat/utils: better probing for duration in estimate_timings_from_pts()"

This reverts commit 650ef180787d9185c98950017e54285d1026eb0b.
Revert "s86/scale: Do not return the result of a (void) function from a void function."

This reverts commit 891307b4d194d4de628da302224c3a97b6f2c840.
Revert "doc/codecs: extend documentation for thread_type option"

This reverts commit 8c443767995db7905282239f2a467a995609a6ff.
Revert "Revert "avcodec: add simpleauto idct""

This reverts commit 7802873a09c99ff681d19af16ec5d001ce725e4a.
Revert "x86/blockdsp: restore author attribution"

This reverts commit a5ce608fc7eaf3a8710624097dcdfb2b29735eb2.
Revert "doc: remove RELEASE_NOTES"

This reverts commit 6fdd19cbb26c94ff6ae0033114fa77c9a33f790b.
Revert "avcodec: add simpleauto idct"

This reverts commit 08c5859f17ed6c16d7e59ea63c63d85cc0d9427f.
Revert "lavc/h264_slice: clarify informational message in case of disabled slice multi-threaded decoding"

This reverts commit d381109ce8acd84fc16d3dfc4f8f688462d45366.