lib: disable logging in dav1d_parse_sequence_header()

The function uses a Dav1dContext internally, so the caller can't disable
logging or use a custom logger. Play it safe and disable logging altogether
to avoid spamming stderr.
16 jobs for master in 11 minutes and 36 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Style
passed #250872
amd64 debian
style-check

00:00:19

 
  Build
passed #250873
amd64 debian
build-debian

00:00:37

passed #250880
debian aarch64
build-debian-aarch64

00:01:28

passed #250881
debian aarch64
build-debian-aarch64-clang-5

00:01:07

passed #250874
amd64 debian
build-debian-static

00:00:35

passed #250883
debian aarch64
build-debian-werror

00:00:33

passed #250875
amd64 debian
build-debian32

00:00:27

passed #250882
macos
build-macos

00:00:27

passed #250878
win32
build-win-arm32

00:00:27

passed #250879
win64
build-win-arm64

00:00:27

passed #250876
win32
build-win32

00:00:33

passed #250877
win64
build-win64

00:00:36

 
  Test
passed #250884
amd64 debian
test-debian

00:00:44

passed #250885
amd64 debian
test-debian-asan

00:02:04

passed #250886
amd64 debian
test-debian-msan

00:00:59

passed #250887
amd64 debian
test-debian-ubsan

00:01:21