gitlab-ci: add build configuration without gl-renderer

Building without gl-renderer seems to fail rather often. Introduce a
specific build job which tests this configuration.

Make use of the Folded Block Scalar in YAML to concatenate the build
option string with spaces. This will make diffing build option
changes very readable.

Signed-off-by: Stefan Agner <stefan@agner.ch>
3 jobs for fix-no-gl-renderer in 1 minute and 18 seconds (queued for 1 second)
Status Job ID Name Coverage
  Container Prep
passed #779496
container_prep

00:00:30

 
  Build
passed #779497
build-native-meson-default-options

00:00:48

passed #779498
build-native-meson-no-gl-renderer

00:00:29