Change CMake flag to produce missing libs in ttk-public.
Change CMake flag to produce missing libs in ttk-public.

NicolasSchnitzler/medInria-public,aabadie/medInria-public,aabadie/medInria-public,rdebroiz/medInria-public,rdebroiz/medInria-public,NicolasSchnitzler/medInria-public,rdebroiz/medInria-public,aabadie/medInria-public,NicolasSchnitzler/medInria-public