Similarly, change it from false to disabled for the udeb.
It's now a feature flag, rather than a boolean.
configure_flags_deb = \
-Dbroadway-backend=true \
-Dcloudproviders=disabled \
- -Dintrospection=true \
+ -Dintrospection=enabled \
-Dman-pages=true \
-Dmedia=none \
-Dprint-backends=all \
-Dwayland-backend=false \
-Dx11-backend=true \
-Dxinerama=disabled \
- -Dintrospection=false \
+ -Dintrospection=disabled \
-Dprint-backends=none \
-Dcolord=disabled \
-Dmedia=none