Fix #1394: correctly determine whether a NAL unit is a VCL unit

6 jobs for !1981 with fix1394 in 15 minutes and 33 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Build
passed #19847
macos
build_macos

00:04:41

passed #19848
ubuntu1604
build_ubuntu1604

00:00:34

passed #19849
ubuntu1804
build_ubuntu1804

00:00:33

passed #19850
ubuntu1804-gcc8
build_ubuntu1804-gcc8

00:00:35

passed #19851
vc191x
build_vc191x

00:15:32

passed #19852
vc192x
build_vc192x

00:13:56