build: make pango optional for demo-clients

The editor requires pango so we should make it optional.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
2 jobs for optional-pango in 4 minutes and 54 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Container Prep
passed container_prep #495910

00:03:48

 
  Build
passed build-native-meson #495911

00:01:06