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 2 minutes and 22 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Container Prep
passed #409799
container_prep

00:01:20

 
  Build
passed #409800
build-native-meson

00:01:02