Add a default revision string if we can't find hg
Add a default revision string if we can't find hg

cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,aduros/SDL,cebash/SDL_PSL1GHT,aduros/SDL,cebash/SDL_PSL1GHT,aduros/SDL,aduros/SDL,aduros/SDL,cebash/SDL_PSL1GHT