build: Link statically against libcellbroadcast subproject

Guido Güntherrequested to merge
guidog/phosh-mobile-settings:cbd-static into main

Otherwise installing in parallel with cellbroadcastd or the shared lib becomes cumbersome. This only affects the subproject build.

Would be nice to have that in 0.49~rc1. /cc @devrtz

Signed-off-by: Guido Günther agx@sigxcpu.org

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