add missing DTK_BUILD_SUPPORT_DISTRIBUTED
add missing DTK_BUILD_SUPPORT_DISTRIBUTED

rdebroiz/dtk,d-tk/dtk,d-tk/dtk,d-tk/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,rdebroiz/dtk,d-tk/dtk,d-tk/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,rdebroiz/dtk,rdebroiz/dtk,d-tk/dtk