Fix build of dtddata.S on macOS / clang

Signed-off-by: Stéphan Kochen <git@stephank.nl>
3 jobs for fix-macos in 1 minute and 48 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Review
passed #9633977
check-commit

00:00:20

 
  Prep
passed #9633978
debian:buster@container-prep

00:01:04

 
  Build
passed #9633979
build-native

00:00:23