messaging_service: Fix undefined reference to current_version
messaging_service: Fix undefined reference to current_version

/usr/include/boost/format/feed_args.hpp:135: undefined reference to
`net::messaging_service::current_version'

gwicke/scylla,shaunstanislaus/scylla,capturePointer/scylla,acbellini/scylla,phonkee/scylla,dwdm/scylla,shaunstanislaus/scylla,shaunstanislaus/scylla,kangkot/scylla,respu/scylla,phonkee/scylla,senseb/scylla,justintung/scylla,guiquanz/scylla,respu/scylla,glommer/scylla,bowlofstew/scylla,gwicke/scylla,raphaelsc/scylla,tempbottle/scylla,capturePointer/scylla,stamhe/scylla,dwdm/scylla,rentongzhang/scylla,victorbriz/scylla,victorbriz/scylla,phonkee/scylla,tempbottle/scylla,rluta/scylla,respu/scylla,rluta/scylla,kangkot/scylla,linearregression/scylla,glommer/scylla,justintung/scylla,rentongzhang/scylla,kjniemi/scylla,scylladb/scylla,victorbriz/scylla,avikivity/scylla,bowlofstew/scylla,eklitzke/scylla,duarten/scylla,wildinto/scylla,asias/scylla,stamhe/scylla,eklitzke/scylla,wildinto/scylla,aruanruan/scylla,justintung/scylla,asias/scylla,capturePointer/scylla,avikivity/scylla,linearregression/scylla,senseb/scylla,wildinto/scylla,duarten/scylla,raphaelsc/scylla,aruanruan/scylla,guiquanz/scylla,acbellini/scylla,gwicke/scylla,scylladb/scylla,kjniemi/scylla,kjniemi/scylla,stamhe/scylla,acbellini/scylla,asias/scylla,dwdm/scylla,scylladb/scylla,rentongzhang/scylla,kangkot/scylla,scylladb/scylla,duarten/scylla,linearregression/scylla,rluta/scylla,guiquanz/scylla,bowlofstew/scylla,raphaelsc/scylla,avikivity/scylla,glommer/scylla,tempbottle/scylla,senseb/scylla,eklitzke/scylla,aruanruan/scylla