DAV1D_MC_IDENTITY requires DAV1D_PIXEL_LAYOUT_I444

Section 6.4.2 (Color config semantics) of the AV1 spec says:
  If matrix_coefficients is equal to MC_IDENTITY, it is a requirement of
  bitstream conformance that subsampling_x is equal to 0 and
  subsampling_y is equal to 0.
33 jobs for patch-5 in 5 minutes and 24 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Style
passed #424524
amd64 docker
style-check

00:00:16

 
  Build
passed #424535
amd64 docker
build-android-aarch64

00:00:19

passed #424534
amd64 docker
build-android-armv7

00:00:18

passed #424525
amd64 avx2 docker
build-debian

00:00:30

passed #424536
aarch64 docker
build-debian-aarch64

00:01:09

passed #424537
aarch64 docker
build-debian-aarch64-clang-5

00:00:59

passed #424540
armv7 docker
build-debian-armv7

00:00:42

passed #424541
armv7 docker
build-debian-armv7-clang-5

00:00:34

passed #424528
amd64 docker
build-debian-examples

00:00:26

passed #424543
ppc64le docker
build-debian-ppc64le

00:01:31

passed #424526
amd64 docker
build-debian-static

00:00:30

passed #424539
aarch64 docker
build-debian-werror

00:00:35

passed #424527
amd64 docker
build-debian32

00:00:31

passed #424538
macos
build-macos

00:00:37

passed #424544
amd64 docker
build-pages

00:00:16

passed #424542
amd64 docker
build-ubuntu-snap

00:00:28

passed #424532
amd64 docker
build-win-arm32

00:00:19

passed #424533
amd64 docker
build-win-arm64

00:00:19

passed #424529
amd64 docker
build-win32

00:00:38

passed #424530
amd64 docker
build-win32-unaligned-stack

00:00:32

passed #424531
amd64 docker
build-win64

00:00:47

 
  Test
passed #424545
amd64 docker
test-debian

00:00:48

98.2241%
passed #424554
aarch64 docker
test-debian-aarch64

00:02:10

passed #424556
armv7 docker
test-debian-armv7-clang-5

00:00:51

passed #424550
amd64 docker
test-debian-asan

00:01:16

passed #424546
avx2 amd64 docker
test-debian-asm

00:00:52

passed #424551
amd64 docker
test-debian-msan

00:00:45

passed #424548
amd64 docker
test-debian-mt

00:00:37

passed #424555
ppc64le docker
test-debian-ppc64le

00:02:24

passed #424552
amd64 docker
test-debian-ubsan

00:01:05

passed #424549
amd64 avx2 docker
test-debian-unaligned-stack

00:00:37

passed #424547
avx2 amd64 docker
test-debian32-asm

00:01:04

passed #424553
amd64 avx2 docker
test-win64

00:01:04