Added missing file to windows solution, fixes windows build
Added missing file to windows solution, fixes windows build

tweakmy/dnp3-old,cverges/dnp3,sentient-energy/emsw-opendnp3-mirror,cverges/dnp3,sentient-energy/emsw-opendnp3-mirror,gec/dnp3,gec/dnp3,sentient-energy/emsw-opendnp3-mirror,cverges/dnp3,sentient-energy/emsw-opendnp3-mirror,gec/dnp3,sentient-energy/emsw-opendnp3-mirror,cverges/dnp3,gec/dnp3,cverges/dnp3,cverges/dnp3,tweakmy/dnp3-old,tweakmy/dnp3-old,tweakmy/dnp3-old,cverges/dnp3,sentient-energy/emsw-opendnp3-mirror,sentient-energy/emsw-opendnp3-mirror