meson: Add not-found dependencies for conditional declared depswip/nirbheek/meson-declare-dependency

Instead of not defining the variable, or defining it to [], define it
to the not-found dependency instead, so that when other projects (such
as gtk+) are using pango as a subproject, they get a valid dependency
object which tells them that the dependency cannot be found.

0 files changed, 0 insertions, 0 deletions