Fix appveyor build for multi-targeting
Fix appveyor build for multi-targeting

ericgreenmix/marten,JasperFx/Marten,ericgreenmix/marten,mysticmind/marten,JasperFx/Marten,ericgreenmix/marten,ericgreenmix/marten,JasperFx/Marten,mysticmind/marten,mysticmind/marten,mysticmind/marten