Declare the 'rdata' argument for dns_rdata_tostruct() to be const

(cherry picked from commit abb2fd10)
7 jobs for 341-constify-dns_rdata_tostruct-v9_9 in 6 minutes and 6 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Precheck
passed #18954
amd64 docker linux
precheck:debian:sid:amd64

00:00:12

 
  Build
passed #18955
amd64 docker linux
build:debian:sid:amd64

00:02:38

passed #18956
i386 docker linux
build:debian:sid:i386

00:02:53

 
  Test
passed #18959
amd64 docker linux
systemtest:debian:sid:amd64

00:02:48

passed #18960
i386 docker linux
systemtest:debian:sid:i386

00:02:59

passed #18957
amd64 docker linux
unittest:debian:sid:amd64

00:00:42

passed #18958
i386 docker linux
unittest:debian:sid:i386

00:00:42