Don't check copyrights on .gitignore files

(cherry picked from commit 718c527e)
7 jobs for pkcs11-missing-gitignore-v9_12 in 6 minutes and 51 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Precheck
passed precheck:debian:sid:amd64 #23640
amd64 docker linux

00:00:12

 
  Build
passed build:debian:sid:amd64 #23641
amd64 docker linux

00:01:40

passed build:debian:sid:i386 #23642
linux i386 docker

00:01:43

 
  Test
passed systemtest:debian:sid:amd64 #23645
amd64 docker linux

00:04:45

passed systemtest:debian:sid:i386 #23646
i386 docker linux

00:04:54

passed unittest:debian:sid:amd64 #23643
amd64 docker linux

00:00:49

passed unittest:debian:sid:i386 #23644
i386 docker linux

00:00:47