Move snc and snr declarations up for another use
Move snc and snr declarations up for another use

mathstuf/sprokit,linus-sherrill/sprokit,Kitware/sprokit,Kitware/sprokit,linus-sherrill/sprokit,mathstuf/sprokit,mathstuf/sprokit,mathstuf/sprokit,linus-sherrill/sprokit,linus-sherrill/sprokit,Kitware/sprokit,Kitware/sprokit